All modern graphics cards support openGL. Its a basic bit of support that all cards are now made with. However in recent times there hasn't been a game on the market that used the newer versions of OGL, which the cards support. And now with the release of DX11 it looks set to be a wasted effort in some camps. DX11 is actually a great api to code on, and its also a great api to game with for us peeps.
The things that makes it good is that if you have a DX9 or Dx10 card you can run DX11 natively. No need to upgrade your hardware to run it. The extra features it has for enhanced effects are not used if you dont have the hardware, so its a very flexible piece of kit (unlike dx10). And for the devs they dont need to make seperate code paths and exe files. DX11 runs DX9 and DX10 natively so if a games made for DX11 it works on any system with Dx9 or better.
So if you have Vista -download the dx11 update
Or better yet upgrade to Windows 7, as its a much better OS and comes with DX11.
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