If you are running GNOME 2.12 on 10.0 RC1 and you have multiple Best icons on your GNOME panel, you can fix that by going into;
Desktop, Gnome Control Center, Sessions, Current Session, remove (1) instance of Best, apply, logout(check save session)/log in.
Overall I'd have to say that 2.12 on RC1 is much better than GNOME was is 9.3. I like it

. Less problems, faster...
EDit: Scratch that fix, both icons come back if you have the Beagle daemon start up on log in. Oh well, I hope this is fixed in the final. There is already a bug openned on it so the developers are aware of the issue.