Finished. Thats the only page on DX 10 in Vista so its a quick read.
So basically DX 10 is ment to make gpus' more flexable and powerful and reduce the cpu load in most cases. And also DX9 drivers optimized for Vista will run faster according to
Nothing to really worry, Vista isn't gonna be out for a while longer and having a DX9 card isn't gonna cripple anybody either. The only big push for DX10 would be when games that are DX10 only come out, i.e. Halo2 on the PC. I can't see a whole lot of developers making a DX10 ony game because you'd have a small audience that can buy your game and that doesn't make profits.