I apologize for resurecting this old thread, but I just wanted to let everyone know there is a very close Bootstrap like CSS framework specifically created for email styling, here is the link: http://zurb.com/ink/
Hope it helps someone.
Ninja edit: It has since been renamed to Foundation for Emails
and the new link is: https://foundation.zurb.com/emails.html
Silent but deadly edit: New link https://get.foundation/emails.html