What should we as Americans do to show that we don't give into Muslim intimidation of our 1st amendment rights?

How should we show our support for South Park's free speech rights to depict Mohammed, and honor those who have died for their free speech rights for depicting Mohammed (Theo Van Gogh, cartoonists, etc..)? I think one way to do so, would be to buy, and wear t-shirts depicting Mohammed. Anyone else have any other ideas?