I typed the links wrong :( I'm sorry, here is the link to my picture, and if you scroll down a comment or two, the other links are there too: http://365project.org/veralynnds/365/2010-03-07
I have a friend that has a 3D rig. He has a tripod that holds two SLRs side by side, and he has the cameras linked so when he hits the shutter release on one, it fires the other. Then he has two lenses with the same focal length.
I hope this helps :)
http://365project.org/veralynnds/365/2010-03-07