Ack, how could I forget. Eric also sent me this link not too long ago. Mike Dabrowski (Insight guru, MIMI inventor) has also been tinkering around with these cells. Hes has some excellent testing results on his site including thermal testing. As you can see, they heat up very uniformly, and the tabs do tend to stay cooler than the rest of the cell.
http://99mpg.com/workshops/designingandbuildi