CAD/CAM users have this neat trackball like device called a spaceball. Lots of manufacturers make them, and it's not unlike a joystick, except you've got a ball instead of a yoke. The thing is, you can pull on it, push on it, twist it in any direction to control things in 3d.
This is pretty cool, at least for CAD/CAM.
Here's a link to a used one available now on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3406319287&category=11193and here's an inline image:

Properly interfaced, this could replace a 360 degree analog joystick, as well as provide a way to do a lot of other interesting things (or so it would seem to me). One of the best things about this as an input device is that it's designed to "stick up" out of a control panel (see pic).
Is this completely impossible? :-)
Anyone have any ideas about this?
Paul