The Good 50×70 poster competition has just published its briefs for the 2009 competition.
This year (as last) they come from Amref (Women’s Rights Violation), Amnesty (War On Terror), Emergency (Healthcare Deprivation), Greenpeace (Nuclear Emergency), Lila (HIV/AIDS), Unicef (Child Labour) and WWF (Climate Change). (2008 results)
Or if you fancy a lighter option there’s always the Streetfighter 4 Design Competition
(both via Computer Arts)