[tnorthcutt]

Seconding the standing desk suggestion. However, if you go to buy a "standing desk" you'll soon find that they're abnormally expensive. If you just want to try it out (somewhat) cheaply and have an IKEA nearby, these links might help:

http://www.ikeahackers.net/2011/01/wide-standing-desk.html

http://www.ikeahackers.net/2011/04/expedit-standing-desk.htm...

http://blogjunkie.net/2011/03/hacking-together-an-ikea-stand...