E-2 visas are missing from the list which may be good co-founder visas.
http://en.wikipedia.org/wiki/E-2_visa
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b...
http://answers.onstartups.com/questions/379/in-lieu-of-an-h-...
http://en.wikipedia.org/wiki/E-2_visa
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b...
http://answers.onstartups.com/questions/379/in-lieu-of-an-h-...
The E-2 visa is really a two-stage thing : The company needs approval, and then the individuals get their E-2s on the back of the company.
FWIW, I've done all the legal work for myself.