Purchase a boxed copy of Deus Ex: Human Revolution for PC and you'll also get a code to redeem a copy to play anywhere via OnLive.
It seems that OnLive is stepping up its attempts to be seen as a major player in the gaming space -- but wisely, rather than marketing itself as a replacement for PC or console gaming, it appears to be taking the approach that it offers a more easily portable alternative. As such, the service has taken to offering redemption codes for the OnLive version of Deus Ex: Human Revolution with retail (boxed) PC copies of the game.
"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 Steve Perlman, president and CEO of OnLive.
This is effectively the gaming equivalent of DVD and Blu-Rays offering iTunes digital copies alongside the physical media, and is an interesting counterpoint to Valve giving a free copy of Portal 2 on PC to those who purchased the PS3 version.
More info on the promotion and how to redeem it here.
Be aware -- some as yet unverified rumors are surfacing that GameStop has been removing the OnLive codes from retail PC copies -- be sure to check your copy before you leave the store if you purchase one from the retail giant.