Jessica Cohen and Bill Easterly have a new edited book coming out called What Works in Development? Thinking Big and Thinking Small. The volume examines the role of randomized evaluations in development research and the contributors are a who’s who of top development economists. You can find Bill’s summary of the book here. Apparently there are some problems getting the book out the door, but it is worth keeping on your radar.
Grad student alert: You can find the original (free) papers that the book is based on here.