Reply #122: Some links here:

[blondeatlast]

Physician's for a National Health Plan: http://www.pnhp.org/

Check out their links site for other great groups;
http://www.pnhp.org/links/national.php

American Medical Student's Association is very active in the movement:
http://www.amsa.org/

I just discovered this site myself, but it looks very helpful:
Everybody In, Nobody Out: http://www.everybodyinnobodyout.org/

Also, The Nation had a GREAT article in I believe the November/December (or thereabouts) 2004 issue about how business is coming around to the idea of UHC. If you get a chance, take a look.