With Bill Gates talking about how to battle malaria and emphasizing how important it is to improve education TED has kicked off for 2009. It has been noted elsewhere Gates is even funny. Well, he surely attempts to be and fortunately doesn't wander off with it.
If you choose to watch Bill Gates on the TED site, you will be offered to continue with a talk from 2007 by Bjorn Lomborg which gives the problem of global warming a rather surprising rating in the list of world problems. The problem of malaria rates higher, to name one that Gates addressed.