What GPU are you running and version of Fedora are you running? Still tinkering with Fedora 18 and 5870 drivers. Did you have any video driver issues?
Also, did your fans settle down to OS X levels? Mine didn't for the first 10 minutes or so, but finally did and got very quiet. So far I like Fedora 18 - it seems to be a solid release. I have honestly steered clear of it when it branched of from Red Hat many years ago any went with some other distos, and I really like the stability of CentOS for a server and for production. Ubuntu went too commercialized for my taste although I used to thing they were on to something good. Not a fan of their new windowing system. I never have considered myself a heavy linux user but like to stay involved in it.