If you buy a retail version of Deus Ex: Human Revolution on PC, you won't actually need the disc in order to play it. In fact, you won't need anything at all, because the copies come packaged with a free code for the OnLive version.
"Gamers get the best of both worlds -- a physical copy for their home PC and an OnLive cloud gaming copy for instant-play anywhere on an HDTV, PC, Mac, and soon iPad and Android tablets," said OnLive president Steve Perlman said. "Having the option of local or cloud gaming provides unprecedented value and convenience that has never before been available for high-performance AAA titles."
It's a pretty cool offer, and a very smart way of getting more people to check out the cloud-based gaming service. Besides which, free is free, so this is nothing to snort at.