Titktaalik

Science & Technology at Scientific American.com: Newfound Fossil Is Transitional between Fish and Landlubbers
Tiktaalik roseae is a wonderful new transitional fossil found recently in the Canadian Arctic. It fits in perfectly, as far as we can tell, in the understood evolutionary history between fish and the early land tetrapods.
Take *that*, “Where are the transitional fossils?” Creationists!
More info is available on the University of Chicago’s site on Titktaalik (whose name amuses me, it sounds like the name of one of the Emperor’s in Steven Brust’s Dragaera novels)