Games with Tessellation Support - Dirt 2 (through update), Alien vs Predator (through update), Metro 2033 (First Game to have it Native), These are just the ones that i have that do have it and run well on my SLI Nvidia 460 GPU's
It's nice and although im not really adding anything to this discussion i would like to say i do hope that they do eventually release an official patch that enables it. As for anybody saying NEW most technologies are old idea's that were just shelved and the creators will eventually bring them out....someday.