CitizenSpeak.org

UPDATE:
The Boston Phoenix profiled Joe Lee with other web political activists in February, 2007

From the Citizenspeak website (http://citizenspeak.org/):

CitizenSpeak is a free web-based advocacy service that allows grassroots organizations to incorporate email campaigns into their communications strategies. With CitizenSpeak, organizations enable their members to email targeted decision-makers one-on-one messages with a single click. CitizenSpeak strengthens organizations'' lobbying efforts by putting immediate pressure on decision-makers and by providing reports on participation.