Available for download for mac users with a ADC membership (free).
Sounds well. Please keep us (*) informed. 
(*) Those observing the Mac market from a (still) Wintel user’s point of view.
You asked to be updated…
Apple has released J2SE 5.0 Release 3. Even better, they have made it part of the automatic Software Update process. (Like Windows Update)
That means that now Java 5.0 will be pushed out to all OS X 10.4 users, at least the ones that don’t uncheck it to save the 43MB download
Note that if you are using the version string “1.4+” or “1.3+” etc. in your JNLP files - the default on Mac OS X is NOT to give you Java 5 if it is installed. There is a Java preferences tool where you pick which JRE is used for Applets, and you also pick if Java 5 must be explicitly requested (“1.5”, “1.5*”, or “1.5+”), or if it is automatically used when “1.4+” or similar is specified. Apple did this because they were concerned about breaking existing 1.4 applications and didn’t have enough feedback that all the 1.4 stuff worked well enough on Java 5. PLEASE send Apple your feedback so that this “gotcha” can be eliminated in the next update.
To work around this WITHOUT requiring end users to change the Java preference you can slightly modify your JNLP in a cross-platform compatible manner. Instead of using only one j2se element with “1.4+”, specify two distinct j2se elements in your JNLP file. The first can be “1.5” or “1.5+”, the second can be “1.4+”. This will cause the Web Start application to prefer the Java 5 JRE regardless of the Mac preference setting for what to do in the case of “1.4+”.
E.g.
From the JNLP File Syntax portionof the Web Start developer’s guide:
The download is big for Mac, because Apple does not make a distiction between the JDK and the JRE. They ship all the JDK tools always… the only thing they leave out is the source code (src.jar) and the developer documenation. That stuff is a seperate download available to anyone via the Apple Developer Connection.
Thanks for the good news.