Very readable abstract here: American Geophysical Union

Also excellent article today on the Cassini website: Is Titan's Shape Caused by its Meteorology and Carbon Cycle?

Sep. 13, 2012
Saturn's moon Titan turns out to be flatter than it should be. Two Cassini scientists have a new and unusual theory about what causes Titan to have the shape it has: weather. Scientists are interested in studying the shapes of planets and moons because these traits can reveal clues to the body's history. Read more...

ADMIN EDIT: Links improved as requested and article removed as it's at the link.