Just found this little feature: I have Spaces set to display my 8 spaces with my 3rd trackball button and exposé set to show all windows when I move to the upper-right corner. So I display Spaces with my third button, then move the mouse to the upper-right hand corner... and... All the little windows in all the little spaces move to be visible in their own little spaces. And... you can click on one of the little windows to switch to that space with that window in front! This pretty much makes up for me having to give up my third button=expose all windows. Best of both worlds, I think.