I bookmarked link to this study some time ago - http://phys.org/news/2011-01-mindfulness-meditation-brain-we...

I've also read "the miracle of mindfulness" which was a pretty good read. You can find a pdf quickly if you know how to use google ;)

I would love to see some more scientific studies on how meditation affects one's brain. I'm not a big fan of all those "metaphysical" writings on meditation. I'd like to treat it more like a consciousness training.