I meant to post this earlier today but forgot.

Based on what I currently know, I think his improvement is genuine. That's not to say that his development will continue in a linear way. Catchers often have strange development paths, and he could regress next year. But I don't think '10 is a fluke, and his stock has obviously shot up again. I rate him as a Grade B+ prospect currently.
Full piece:
http://www.minorleagueball.com/2010/...devin-mesoraco