T3CH released a new SVN compile (rev20439) of XBMC for Xbox(info).
This T3CH-compile is a complete snapshot of what is in SVN at the time the build was compiled, with just a few small additions.

Special Notes and Noteworthy/XML/Script changes:
* Check out the full changelog since the May 09th 2009 Svn Rev19947 build here

Keep in mind this is a SVN snapshot of the current development tree. It’s not an official (stable) point release. Use only if you know what you are doing.

Official XBMC Site: http://xbmc.org (manual and FAQ)
Official T3CH Site: http://t3ch.yi.se (release RSS feed)
Downloads: Xbox Bins (n/a – built with XDK) | other platforms | sourcecode