(Pardon if I got the wrong component -- I think the control center got folded into the shell, and I don't see any other likely process started)

I've been frustrated with gnome3 for a while because whenever I try to click a link in xchat, it brings up epiphany, which doesn't do Sync, doesn't do Greasemonkey, doesn't do flash, and is generally the wrong answer.

On gnome2, I just used the settings menu -> Preferred Applications to switch to firefox.  I couldn't find a way under the shell -- I looked under system settings, which seemed like the equivalent, but it wasn't until I raged in IRC that someone told me it was under System Info.

To me, "System Info" means "here are a couple of read-only tabs about how much memory you have, what your CPU is, how big your disk is, what distro you've got, etc.".  And it is mostly that, except for the Preferred Applications tab, which I think is totally out of place.  I was not going to discover that on my own.

I think it merits being promoted up a level to System Settings -- I think it will be used almost as much as the other items there.