I'm having the same issue. I upgraded Fedora x86_64 from 15 to 16, and gnome-shell segfaults after booting. I haven't tried using the noveau driver.
seems to think that it's an issue with the latest version of gdm.
Originally Posted by Plagman
Can you check whether this still happens with driver 290.06?
The latest drivers in rpmfusion are 285.05.09, so I can't check.