In FC5, when you put acroread in full screen mode, it doesn't really go FULL screen -- the gnome panels are still there. evince does not behave this way, but there are still PDF files for which acroread does a better job. this is NOT a trivial problem for those of us who travel/teach with laptops and make full-screen PDF presentations. pushing the panels back on an ad-hoc basis is a kludge. there have been various posts on the web about dealing with this under debian but I have not seen anything for FC. Thanks.
I just noticed that if the panels are hidden by enabling (and using) the hide buttons, the results are much more satisfactory than when enabling auto-hide. Still feels like a cludge but it works better.
Fixed in metacity 2.15.x. (FC5 used metacity 2.14.x) See http://bugzilla.gnome.org/show_bug.cgi?id=343115. Affected lots of apps besides just acroread.
In other words: should be fixed in rawhide.