Tracking and Replacing tutorials

Harry Frank has a tracking and roto tutorial (among many others) at his Graymachine website -- "this one was a particular challenge: replacing a spinning record label with an overlapping hand. This covers tracking, rotoscoping, and various types of manual animation to match the movement in the shot."

Also, Imagineer Systems has tutorials for their tracking and roto apps including Mocha/AE (see comparison movie), as well as great deals for freelancers. The deal was extended and is active until 03/31/08; the freelancer code is "edu-mar08-90-imagineer" (no paren).