Battlefield: Bad Company 2
If this is a sign of what we're in store for with Battlefield 3 in 3D, PC gamers are going to be in for a treat later in the year. DICE's game already looked brilliant on a decent spec PC, and in 3D the game feels even more explosive and exhilarating. Show this to your console-owning friends and watch them weep.
The PC version of Crysis 2 not only looks hugely superior to the console versions, but you can play it in 3D without the game turning into a slideshow. Crysis 2 doesn't quite have the same 'pop' in 3D as some of the other games on this list, but the extra depth in each scene adds to the realism of the game world.