I’ve upgraded four systems to Fedora 9 in the past couple of weeks. For those that have NVidia cards, it was a bumpy ride until NVidia released a new driver. To install it as a pre-built RPM package, see this blog post.
For the system that runs VMWare Server, it was necessary to upgrade to version 1.0.6, which supports the 2.6.25 kernel shipped with Fedora 9.