Busted Racquet contributor Patrick Mourtaoglou, a famed French tennis coach who has worked with stars like Aravane Rezai and Marcos Baghdatis, recently produced a video which analyzes the serve of world No. 1 Rafael Nadal.
There's some great stuff in this short video. Mourtaoglou details how Nadal's serve was a weakness early in his tennis career (and he has the clips from Rafa's junior career to prove it) and breaks down the step-by-step changes Rafa has made over the past few years (some good, some bad). The subtle bent-elbow technique that Rafa and Uncle Toni developed this summer in preparation for the U.S. Open aided in Rafa's first win in New York.
One day I hope to make a similar video that breaks down the ever-changing length of Nadal's shorts. He went from John Stockton circa 1987 in the first clip to 1994 Chris Webber in the second.