I'm a big fan of out-of-the-box, attention-grabbing ads. These ones are running in the Farragut North metro stop here in DC (one of the busiest downtown stops and frequented a lot by DC organizational/lobbyist types) and I thought I would share.
"Close Guantanamo. End Torture. Investigate All Abuses."
"...it (torture) serves as a great propaganda tool for those who recruit people to fight against us."-Sen. John McCain talking about torture, FOX News, March 20, 2009
Osama bin Laden wearing an "I <3 Guantanamo" t-shirt
These are a sampling I took while waiting for a train. They're being run by Avaaz.org, which is doing a campaign to pressure Obama on the issue. More about it here.