beta just came out today .. I use this on my xbox and it's awesome .. plays any type of file expect HD

just tried it on PC and it runs 720p pretty good .. apple trailers don't seem to work for me though

the best part about xbmc is you can play .rars .. so no extracting needed .. even if you have just started downloading something .. you can start playing as it's downloading

http://xbmc.org/download/