I’ve started using FVWM plus gnome at work. Its a bit of a pain in the ass to get gnome to run a separate window manager cleanly, but it does seem to work now. One annoying bug that people do seem to know about is that if you have multiple gnome panels, then the come up in the wrong place on start up. Something to do with how FVWM can’t tell the difference between the different panels or something.
Anyways, I’ve forgotten, how much of the interaction with your desktop linux is still controlled by the window manager. If I want metacity, I can always switch back, or I can use some simpler fvwm setup, but having the flexibility to run all these bindings is sure nice.