Spore Galactic Adventures, set to be available at launch on June 23. The campaign was conceptualized by Seth Green and Matt Senreich, then presumably executed by their underlings. The DLC includes "exploding poo, angry yetis, ruler yielding librarians and more," of course.
The team's exploits (in creating the DLC, we hope) will be tracked at the Spore WTF site. At least getting the Robot Chicken crew involved might get "the targeted demographic" talking about Spore again.