Famine Early Warning System (USAID)

USAID has done an excellent job putting together its interface for the Famine Early Warning System. The data here is well-organized and, for the countries listed (largely in Africa), very complete. It seems to be well integrated with the UN's ReliefWeb as well (ReliefWeb, for those of you not familiar with it, is one of the outstanding resources provided by the UN. Covering virtually every country where there is a humanitarian crisis, the site hosts some of the most up to date information and some of the very best maps you can find on the web).