One of the speakers I particularly enjoyed hearing from at the Myer Melanesia MDG conference was David Roodman from the Center for Global Development (his blog here).
The first interview I did with him follows a presentation he did on some of the fascinating micro finance innovations currently taking place in Kenya — predominantly through the very impressive M-Pesa. (The Economist also looked at these recently.)
The second interview covered the Commitment to Development Index, which David was involved in setting up. The CDI has a pretty handy website too.