protest posters

A friend blogged recently about graffiti and protest posters in Oaxaca, Mexico. And it got me wondering where's our beautifully crafted protest posters? The only one that came to mind was War By Numbers - Gold by Shepard Fairey. Fusshop has Artist Proofs from a collection of limited edition prints. This particular one is sold out. If you have links to others, please share them! I'd love to see more.