it's XBMC, one of available skins to be downloaded found on default installation in XBMC too. Hardware is as in signature, which means that it's just the XBMC full screen on third monitor connected to the PC.
Lurk, Lurk then Post!
pretty much a summary.
Movie Corner (3rd display full screen XBMC)
I'll post the case too (HAF 922, not a huge deal), it just seems a little full of dirt particles to me (plus the noise that's added from the crap camera phone) so [MERCY!]