Voters for Peace Pledge

Voters for Peace is asking people to sign their peace pledge, by which you pledge to only support federal candidates who'll promise to end the war in Iraq and prevent future wars of aggression. The War Party will likely ignore it, but still, it's an easy and inexpensive way for you to promote peace.

If you want to go a step further, Voters for Peace also sells peace merchandise on their site.

And they accept online donations.