Here's a link to an article on other-world plate tectonics. I should have another installment up on my own tectonic journey in the next day or two. (By the way, I'm finding The Daily Galaxy, another typepad blog, to be a great source for space science news.)
The discovery of plate tectonics on Europa indicates the first sign of this type of surface-shifting geological activity on a world other than Earth. Researchers have clear visual evidence of Europa’s icy crust expanding. However, they could not find areas where the old crust was destroyed to make room for the new. While examining Europa images taken by NASA’s Galileo orbiter in the early 2000s, planetary geologists Simon Kattenhorn, of the University of Idaho and Louise Prockter, of the Johns Hopkins University Applied Physics Laboratory discovered some unusual geological boundaries.