Check out this incredible series of posters by Wanderlust for Earth Day. Each depicts one of the 7 continents, and a portion of proceeds go to Oxfam and Doctors Without Borders.
Wanderlust
The Haiti Poster Project
By the same folks who brought you the Hurricane Poster Project (benefitting victims of Katrina), comes the Haiti Poster Project, with proceeds going to Doctors Without Borders. There are a ton of entries (over 300) by some very talented folks. Below is my entry depicting an overhead view of a refugee tent city, that upon further inspection reveals a message of hope. You don't have to buy mine, but check out the site and consider buying a poster...at least as a donation to DWB.
The Haiti Poster Project
Moxie Sozo, the organizer of the 2005 Hurricane Poster Project, is teaming up with Josh Higgins, the organizer of the 2007 So-Cal Fire Poster Project to produce the 2010 Haiti Poster Project. Their goal is to raise upwards of $1,000,000 for Doctors Without Borders by collecting and selling the works of some of the world's best designers. Start printing, people!