This T3CH-compile is a BAREBONE package (so less stuff that can cause issues) compiled with XDK v5849.
Here's the added and updated stuff since the 2005-08-07 CVS release - for the full changelog including the fixed and changed stuff go to the forum thread:
* added: progress for vobsub processing
* added: A message box is now shown when a share is not available or its configuration is wrong
* added: progress dialog automatically pops up after 1.5 seconds of init when using mplayer on all medias, no only online.
* added: integrated the Music Top 100 view into the Music Library at the top level (old window has not been removed yet)
* added: proper action codes for entering dvdmenu, Keymap - showvideomenu, Skin - XBMC.PlayerControl(showvideomenu)
* added: dvdplayer menu animation when a menu button is clicked
* added: %S to the music track naming template to display the "Part of Set" identifier (aka Disc #)
* added: ability to specify cache path (currently only used for compressed rar files) in xboxmediacenter.xml.
* updated: mplayer.dll (better rewind, no skip after fastforward, better interlaced detection) + codecs.conf
* updated: added $CDRIPS to the list of special directory tokens

You can add more scripts and skins yourself if desired. You can download them from allxboxskins.com, xbox-skins.net and xbmcscripts.com.
Keep in mind this is a CVS snapshot of the current development tree. It's not a official (stable) point release. Use only if you know what you are doing.