Monk(ey) Minds on Metta. A recent study (PDF) examined changes in the brains of meditating scanning their brains while they practiced compassion (metta) meditation. The project was a collaboration between the University of Wisconsin and the Shechen Monastery in Nepal.
I'm always fascinated by research that looks at the mind from both inside and outside simultaneously. It's like watching two people who speak different languages, one young and one old, learning to communicate for the first time.