I have not tried this and don't know if it works. But thought it would be interesting for all you dedicated users of Sketchup or other 3D design programs.
Supposedly you can work in all 3 dimensions without moving your hand from the mouse.
http://www.kk.org/cooltools/archives/001524.php
Also the blog (Cool tools) is pretty good for lots of (guess what?) cool tools like the old Whole Earth Catalog if you remember that.
http://www.kk.org/cooltools/index.php
