79100 Kraang Lab Escape
79101 Shredder's Dragon Bike (featuring Donatello, Shredder, and Foot Soldier)
79102 Stealth Shell in Pursuit
79103 Turtle Lair Attack
79104 The Shellraiser Street Chase
79105 Baxter Robot Rampage
Note that I'm not a TMNT fan at all; everything I know about the source material comes either from wiki walks or from following discussion of this LEGO theme on other sites. With that said, the sets look pretty good-- generally accurate to the source material, with clever building techniques for executing the unorthodox subject matter.
I do think it's a nice touch that the human characters are stylized to resemble regular minifigures, rather than given cartoon eyes like the sets based on Avatar: The Last Airbender or Star Wars: Clone Wars. There are also some great parts in these sets: a bunch of parts in 330 Olive Green and some interesting parts like Barraki eyes and Bohrok eyes in 315 Silver Metallic.
With its colorful, toyetic aesthetic and zany subject matter, TMNT is a good fit for LEGO, and my only regret about this theme is that it makes it seem all the more unlikely that we'll see a theme based on The Legend of Korra any time soon.
EDIT: Thanks to everyone who pointed out the error in my links for 79105. They've been fixed now.
Edited by Aanchir: Rachira of Time, Nov 09 2012 - 08:19 AM.