CHAOTICPIXEL  Nothing like being left behind because I don't have the money to go out and buy a new computer every 3 years. Thanks Apple for making my bleak finances more obvious. I guess my dual 2, PPC G5 will slowly be faded out along with music tapes, common sense and hope for universal health care. Yippee!  
(Version Update 4)

ESPIRIDION  So far two programs refuse to work on my system; Consideo Modeler and Quantrix Modeler.

Both seem to require Java 1.6, however the latest Java version for PPC computers is 1.5 and 1.6 is for Intel machines only.

The developers seem to be very responsive, but I don't know whether there's much they can do.  
(Version Update 2)

DGEO  I don't know how Apple does it but they succeeded in what others couldn't do; constrain a seemingly open platform to a single CPU architecture. Maybe it was just strategic movement, maybe they were trying to cut expenses, maybe they had to completely kill PPC because their CPU supplier (Intel) commanded so, maybe it was just programming incompetence. They just look silly to me; JDK1.6 was available in beta for PPC ages ago (both 32bit and 64bit) and x86 Java is universally available in every platform out there (well, almost). I guess if they didn't have to control everything and let Sun do an OSX version things would have been better for all.  
(Version Update 2)

MISHA  Nice--only took about 2.5 months to release this after Sun made it available for other platforms.

The way Apple is working this whole Java thing is really embarrassing. Java was supposed to be a cornerstone of OS X, it's really a second-class citizen.

For those wondering, from what I understand, the reason for the delays between Sun's releases and Apple's OS X release is because Apple's own engineers need to substantially rework and improve the code to make it run at all decently under OS X (and even then the performance isn't up to par with other platforms).   
(Version Update 2)

UMAROMC  To double check version open Terminal.app and type; "java -version"

PEACE!  
(Version Release 6)

RONALD PRICE  Everything here works fine, as it did before the update.  
(Version )

ESPIRIDION  People using Java based software may want to contact the software developer(s) to confirm that the software will work with this update.

From what I've seen, (for me) so far only Araxis Ketura has been affected:

"We have reason to believe that this update might be incompatible with Ketura and thus render Ketura inoperable...We strongly suggest that, until we can test Ketura with this update, you do not install it on a Mac OS X 10.5 Leopard machine hosting your Ketura server..."

Araxis provide wonderful support so I'm sure they'll get this fixed soon.  
(Version Update 5)

HAPPIER NOW  This fixed a number of problems I was having when using Safari with the gay.com java chat system.

Thank you Apple!  
(Version )

JOHN CLULEY  Sorry forgot to say that as usual I have had no troubles after installing this Apple provided and tested update.Keep up the great work Apple.  
(Version )

YOWSA  Installed with no issues whatever on a 1.5 GHz PowerBook running 10.4.2

No permissions errors found after the install. Also ran DiskWarrior after the install, no errors found.

Since OS X 10.1 (if I remember correctly) Apple has done right by me and my Macs regarding whatever Apple update you care to mention.  
(Version )