Wow, my son's going to go nuts when he sees these in the stores! We're currently having fun with the new Alien Invasion sets, which are totally awesome. We also got the Star Wars Hoth/Wampa set recently, which was also good fun -- the Wampa even comes with a chicken leg to eat...!

PS: My daughter loves the Spongebob sets.  We have a cool Bikini Bottom one from a couple of years ago that's still good fun.