I’m not sure what I think of Gnome 3′s Shell Interface. Imma try it out but I think they may have fallen into the trap of making the desktop the point rather than, well, emacs and a web browser the point (the only two pieces of software I use every day and both days). Either way, Fedora 15 looks interesting, and it does use Gnome 3 Shell.
Linux in Exile has a review. The LIE author is really into Fedora, and seems to know a lot about it, so this is rather useful. Here.