I don't believe that you can build and enable 3D support(easily) for Fedora 9 at this time due to changes in Xorg. I plan on waiting until they get it all sorted out.
Here's a link with info on getting your nVidia card working F9nVidia
I'm still going to wait as I've been down this road before and it's "rough and rocky" and not as much fun as it used to be. Must be getting old!