"running 2.5Ghz MacBook Pro. Tried initially with via software update. hung for almost an hour.
Tried the 10.5.6 Update (372MB) download. worked like a charm without any delays.
-Brian"

" I'm attempting to run the Combo 10.5.6 package on my Powerbook G4. I did a clean reboot, and quit all programs. I ran a SHA1 checksum and it checked out. However the update has failed twice, once with a message saying the source was damaged, and then with a message saying the package couldn't be verified. I'm going to try to repair permissions and reboot again, and give it another go.
-Rob"

I asked if he'd tried the standard (delta) 10.5.6 updater (assuming he had 10.5.5 previously).

" It appears that DDC monitor calibrating software is broken under 10.5.6.
Lacie Blue Eye Pro V4 will not run at all and ColorEyes Pro (version?) says DDC initialization failed. None of this happened with 10.5.5.
-Doyle"

It won't help if the software is really incompatible with 10.5.6, but asked if he tried disconnecting/reconnecting the USB cable for these (old tip for some USB device problems after OS X updates). I searched for product pages for these to see if there were any recent updates - the Lacie Blue Eye Pro support page had a download link dated Jan 1st, 2005 (no version listed) and the ColorEyes Pro page I found listed Mac v1.42, but the demo download page listed Mac v1.5.0. I asked what version he was using. Update: He later wrote the problem wasn't common to his Mac Pro 10.5.6 install, only with his G5:

"Did a test on a backup partition on the MacPro. DDC seems to be working with Lacie Blue Eye Pro and Color Eyes Pro. Looks like something with the G5 and 10.5.6 is not compatible.

One weird thing though. Both front USB ports quit functioning a week or so ago. On 10.5.5 I get one message about them when I first boot up. With 10.5.6 I get constant messages. So much so I could get any work done if I wanted to. I have no idea why that is different.
-Rob"

Several G5 owners have mentioned updater problems (reinstalling 10.5.6 from a D/L updater after booting from other than the 10.5.x HD is worth trying) But if the G5 has USB port problems, it won't be a fix for that.

" FWIW, I tried the Software Update route (190MB), it seemed to hang in the Safe mode, only a 1/8in progress bar that didn't move for a half hour - so I bailed and am downloading the Standalone (372MB) Updater to see how that goes. The full Combo is over 650MB (669MB, but worth it IHMO - plus I save a copy of it to an ext. drive to update other Macs and in case I reinstall Leopard from my 10.5.0 DVD.-Mike)
(he later wrote)
Updated my iBook G4 using the download updater in just a few minutes, so I think there may be something going on in Software Update. 10.5.6 does do a double re-boot in the process after the Restart (that's normal and seen with some previous updates) but all is well so far.
Entourage took awhile to fire up, but it never went into that Safe Mode. All seems well.
-George"

" Minor hiccup installing 10.5.6 on 2005-era Powerbook G4 (1.67GHz, 1.5GB RAM, 250GB HD) -- after installing with software update and allowing system to reboot, built-in audio did not work, and no sound came out of the external audio (headphones) jack. Audio sources tested included iTunes, Slingplayer, and system sounds (Sounds control panel). Control panel showed audio at maximum.
After a full shutdown, 30 secs wait, and restart, audio returned normally. Probably a minor startup problem, but thank goodness it resolved by itself.
-Peter"

" No problems running it here on a MacBook Pro.
(he later wrote
My internal optical drive makes the open/close noise like when you're rebooting every 5 minutes or so since the update. Whirr-click click.
The new MacBook Pro 15in I had installed the dev betas on does / did not do this. Strange to say the least.
(name withheld by request)"

If you see any pros or cons (including any broken addons, apps, etc.) with 10.5.6 (again I recommend using the DL/Combo updater and a clean restart first - and a current backup of your 10.5.5 drive.) let me know the details.

"The 10.5.6 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac.
For detailed information on this update, please visit this website:
http://support.apple.com/kb/HT3194 ("About the Mac OS X 10.5.6 Update" - w/details on Address Book, AirPort, Client management, iChat, Graphics, Mail, MobileMe, Networking, Printing, Parental Controls, Time Machine, Safari and General improvements).
For detailed information on security updates, please visit this website:
http://support.apple.com/kb/HT1222 (Apple security updates)."

The Apple security updates page has a link to a doc with details on the security content of Security Update 2008-008/Mac OS X v10.5.6 - so apparently there's a Security update (2008-008) for OS X Tiger (10.4.11) also.
As always I'm going to use the Combo updater download (and restart the mac before updating from it). (And I have a current Time Machine backup as well as a recent CCC clone of my 10.5.5 boot drive to the Ministack, just in case.) If you see any pros or cons (including any broken addons, apps, etc.) let me know the details and include a note if you used a download updater or Software Update. Thanks. (See later post above for some initial feedback including mine.)
Here's links to download pages at Apple:

• Mac OS X 10.5.6 Combo Updater
• Mac OS X 10.5.6 Update (delta)
• Mac OS X Server Combo 10.5.6 updater
• Mac OS X Server 10.5.6
  
  D/L pages for OS X Tiger Security Update 2008-008
• Security Update 2008-008 (Client Intel)
• Security Update 2008-008 (Client PPC)
• Security Update 2008-008 (Server Universal)
• Security Update 2008-008 (Server PPC)

There's also some related Apple doc updates today (see listing below).

" Both the new (late 2008) MacBook and MacBook Pro unibody can fit 12.5mm HDD. I have tested it in both notebooks.
Regards,
Andrej H.
Servisny technik Apple"

DVD+R/RW + DVD-R/RW Drives:
• IDE Pioneer DVR-116D in iMac G4 (OS X 10.5.x)
  (FYI: Macs/Systems page, iMac section has an iMac G4 (15in) Take-Apart for Drive and RAM upgrades article)
  
  Hard Drives:
• SATA Western Digital 500GB Scorpio in (2006) MacBook Pro (OS X 10.5.x)
  (includes comments comparing drive noise to the original Hitachi 120GB drive)
• SATA Western Digital 1TB Caviar GP in (2006 intel-cpu) iMac (OS X 10.5.x)
• IDE Western Digital 320GB in (20in) iMac G4 (OS X 10.5.x)
  (long report on take-apart and reminder on WD drive jumper settings)

You can read full reports (latest shown first) by searching the database by drive type/brand/interface/mac models. Includes reports on Optical Drives (Blu-Ray, DVD, CD/CDR, etc.), Hard Drives, SSD, Tape drives, Removable media (ORB, ZIP, MO drives), NAS (Network Attached Storage), in all interface types (IDE, SATA, Firewire, SCSI, USB, adapters). To widen search results you can leave drive brand, OS version (or other fields) blank.
If you've added/upgraded a drive in your Mac send me the details (drive info/speed rating/mac model/OS version used, etc.). Note: Please use the drive for at least a week before reporting on it and test for booting from Disc with Optical Drives (as well as burning discs). Thanks.

• Intel T2400 Core Duo 1.83GHz (salvaged from PC laptop) in Mac Mini (intel CPU)
  (Reader FYI - macs/systems page has link to earlier page of reports on Mac Mini Core 2 Duo CPU Upgrades. Intel-based Mini's have socketed CPU.)

If you've upgraded the CPU on your Mac, send a review with your experience (performance/stability/installation, etc.), Mac Model/Upgrade brand info and overall rating (1= worst to 10=best). If you can, please run some tests with the original CPU vs the upgrade (for example time some tests with your favorite app, game, etc. - see full reviews here for example tests with common apps/games/benchmarks.)

• About the Mac OS X 10.5.6 Update (details on chgs)
• About the security content of Security Update 2008-008/Mac OS X v10.5.6
• About the Mac OS X Server 10.5.6 Update
• Time Machine: Troubleshooting backup issues
• MobileMe: Service Updates as of December 15, 2008
• MobileMe: Email messages are not received
• Mac OS X Server 10.5 - 10.5.5: Using Podcast Producer with the Active Directory plugin
• OS X: Application unexpectedly quits when printing to a shared printer
• OS X Server 10.5: Web authentication methods for Podcast Producer
• OS X Server 10.5: Creating Service Principal for Podcast Producer in an Open Directory environment
• OS X 10.5: Duplicate computer name alert when binding to Open Directory
• MobileMe: About sync intervals in Mac OS X and Microsoft Windows
• iMovie '08: Cannot see or control camera
• iPhone: About using the Emoji keyboard
• About activating iPhone 3G with a wireless carrier
• Mac OS X 10.5: Digital camera RAW formats supported

• Apple Quick Tip Video: Move Windows Between Spaces
• Bonjour for Windows v1.0.6
• Radioshift Touch for iPhone/iPod Touch
• Perian 1.1.3 (codec) (anyone used this under 10.5.6?)
• BBEdit 9.1 released
• Cocktail 4.2.1 (Tiger Edition) released
• The MacBook Air's fatal wireless flaw (lack of 3G modem) (cnet)
• Microsoft offers free image browsing app for iPhone (Seadragon Mobile)
• Katamari rolls onto iPhone
• Quinn 3.5.4 (Tetris clone w/network support - free)
• Glims 1.0b11 (addon for safari)
• OnyX 2.0b3
• Petz: Dogz 2 1.0 (Demo)
• ControllerMate 4.3.9
• CleanApp 3.0.2 (App deinstaller and archiver)
• Is iTunes the Evolution of Music? Maybe Not (pcmag)
• Hack of the Clones: Why Apple Can't Stop the Copies (wired)
• 2008 Year in review: Apple's iPhone takes off (cnet)
• Blu or Not: Wall-E, Death Race, Burn After Reading, Polar Express 3D
• Prince of Persia PC is DRM-free
• Sony To Debut 32GB 3.3-inch Wi-Fi Touchscreen Walkman
• How to Safeguard Against New IE Vulnerability (PCmag)
• Microsoft update leaves some bugs unpatched (computerworld)