Yipee! It's now available for download here:

http://prdownloads.sourceforge.net/xaja … p?download

Read the release notes that come with the download; they're fairly detailed. Those, the latest tests files, and the inline documentation should help you get started. We'll be updating a bunch of stuff on the wiki soon.

Be sure to check out the official 0.5 Beta 1 thread in the General xajax Discussion forum. Enjoy!

Jared