In evolution, if I type ctl-s, the find window popups up. But the keyboard focus does not switch to the find popup but instead stays is the message header list. In RH7.2, the focus switched to the find menu and this is probably the desired behavior. Possibly, this is a metacity bug but I don't know enough about it to say...
I get the same thing in other apps with popups, so I'm not convinced this is the wrong behavior
It's http://bugzilla.gnome.org/show_bug.cgi?id=89981 closing on Red Hat level, we'll get any upstream changes