I haven't got an XBox so don't really know much about it, other than what BH said above about XBMC. Is the question actually what media servers the XBox can see natively? This doesn't help us with the T2, but I would presume an XBox would be able to see media on a Windows PC that's shared using Media Player on XP, or whatever the equivalent service is on Win7 (homegroup sharing??).
DLNA is supposed to allow anything to work with anything else... *cough*yeahright!*cough*