Today I woke up and I decided that was enough for Fedora 14. I upgrade straight to Fedora 15 rawhide.
Instead of reinstalling I just update with preupgrade. So far so good. Apart for a crash in the kernel during the boot, some errors in the configuration of the Xorg, kernel panic and random problem here and there, hammering, I finally managed to make it works.
Gnome 3 looks good.
I will write something about it soon.