I found a really cool program today that has expose (found on Mac OS X) on a standard X11 distribution.

It's called skippy. You need a Gnome / NetWM compliant window manager, but it's still better than expocity since it's less WM dependent.

I've put debs up here:

http://www.debian.org.hk/~glee/deb/skippy/

Very cool.

I really cannot say how much I miss the expose feature when I'm not working on OS X.

Currently during first "expose-like" invocation it's slow because according to the author an X11 window snapshot can only be taken after you take focus: this would not be a problem once Debian switches over to Xorg.