As well as the Java 1.6 release on Leopard the default release for Intel and PPC adds support for some native OSX features that are not available on the Tiger release . In Jaikoz 2.4 I made use of this to display a search box that looks like a native Search field
whereas on Tiger it looks like a standard OSX entry field
In the next release I hope to make much more use of these features, whilst maintaining Tiger compatability.
Apple has just released JavaUpdate1 - Java 1.6 for OSX Leopard (Intel). I tried it out with Jaikoz and it seems to work ok but I havent tested it extensively. If you install it using SoftwareUpdate Jaikoz will not use it by default but you can try Jaikoz with this if you wish as follows
In Finder right click Jaikoz and select Show Package Contents
Select Contents
Right click Info.plist and select Open With Text Editor
Find the line 1.5+ and change it to 1.6
Save Changes
Start Jaikoz in the console windows you should be able to confirm if it is using 1.6
Using 1.6 does not add any new features new Jaikoz, but it should increase its responsiveness.