You may have noticed GMRC has taken a beating in the last few weeks. If you read through this presentation by David Einhorn you will see why. I would recommend this read for all investors, as Einhorn puts together an interesting/compelling analysis. Also, and more importantly, he will prevent you from buying GMCR.
The guy who developed this analysis was one of the first to call out Lehman's problems in 2008, so he has solid track record.