I came across this discussion about Panda lowering the weight of 'exact match domains' and 'keyword in the domain' rankings (for .com, .net, and .org).

Matt Cutts explains that Google has looked at rankings and weight that they give to keyword domains. Some people have complained that Google is giving to much weight for keywords in the domain and that Google will be turning the knob down with the algorithm so that it won't help you so much.

See: Google's Panda Update 2.0 And Domain Ranking Weight