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Noticed an upgrade to Openbox 3.4 in a yum update recently and I went to checkout the website and found a mountain of new features. For anyone who finds Metacity a little too simple and/or slow, Openbox makes a great configurable clean replacement. Same goes with KDE actually, and as of this release you should see Gnome/Openbox and KDE/Openbox listed in your gdm sessions menu, which makes the switch that much easier.
Fedora Core 6, Gnome 2.16, Openbox (although you can't really see it), Snowish icons, and Clearlooks-quicksilver GTK theme, which I can't seem to find a link to.