I used Fedora 7 and Crossover with an ATI Radeon 9550 and the sad truth is that I can get it to install but it runs way to slow to use and on Ubuntu I was able to get it up and running like twice but I am not a huge fan of Ubuntu mainly due to the fact it is a Debian based system and I am used to an Redhat based system. Also for some reason the Radeon xorg driver works fine for 3D out of the box but the Direct Rendering capabilities of my card are not there so this may be the issue as well.
My Point is are there other Fedora users our there with a similar ATI card that may have gotten this bad boy to work in Crossover