What Was The Best Selling Toy?

I don't have kids only nephews. So I'm not into what the best-selling toys are every year. However, just as a spectator I always like to be somewhat aware if there's going to be a Tickle Me Elmo fiasco like there was that one year. I checked some lists but it might be too early to see which one actually sold the most. There were lots of predictions and lists. (Yes, an Elmo version was on there) Most of these were from the UK though. Plus, they all had like 10-15 toys on them; which doesn't help to track down the best-selling one. What would you guess that it was for the 2011 Christmas Season?