This is from AMERICAblog, and there are a few more details there such as a link to a sample phone script.

KEY SENATORS WHO NEED TO HEAR FROM REPEAL SUPPORTERS NOW:

–Susan Collins (R-ME);

–Olympia Snowe (R-ME);

–Richard Lugar (R-IN);

–Judd Gregg (R-NH);

–Scott Brown (R-MA)

–George Voinovich (R-OH);

–Kit Bond (R-MO);

–Joe Manchin (D-WV)

–Lisa Murkowski (R-AK)

–Mark Kirk (R-IL)

via AMERICAblog Gay: SLDN’s target list of Senators who need to hear from DADT repeal supporters NOW.