From Informed Comment: Human Rights First has a petition about the Darfur conflict in Sudan They're trying to get 200,000 signatures to ask the UN to appoint a special envoy to deal with the situation. Please take the time to go to the site, see the short flash movie they have prepared, and read about why a envoy would be useful.
Also: an article by Nicholas Kristof on the subject. He also suggests that an envoy would help. Last time I was in the School for International and Public Affairs of Columbia University, there was an exhibition of crayon drawings by refugee children from Darfur, showing the attacks on their villages. Heartbreaking.