Tried out Gnome 2.2 via Garnome today. It built fine, but, alas, completely failed to work. Starting nautilus from within KDE was so swap-happy (on a 512Mb machine) it took me five minutes to get to a shell to kill it. Xnest, exactly as described in the Garnome README, just gave a black screen. Starting gnome-session from a new X session just left the cpu pegged at 100% on the splash screen and didn't progress from there.
I don't know why Gnome hates me, but it does. Of course, every KDE release I've built has worked just fine.
