TXTmob is a service that lets you quickly and easily share txt messages with friends, comrades, and total strangers. The format is similar to an email b-board system. You can sign up to send and receive messages from various groups, which are organized around a range of different topics.
TXTMob was designed for use by protestors at the Democratic National Convention in Boston this summer. It is currently being revamped for use at the Republican National Convention in New York this August.