New Mocha AE tutorial available
One of a few tracking systems that are available is called Mocha AE from Imagineer Systems. They offer a 'planar' tracking system which is different than a pixel based one. Ross Shain, a friend of mine who works at Imagineer recently emailed me about a new tutorial he had done specifically around Mocha AE for After Effects users and so I am passing it on to you to evaluate. Give it a watch and perhaps a spin when you next need a tracking shot.
Mocha AE tutorial for After Effects

As a reminder, I did a short tutorial on After Effects tracking some time ago. I'll post the link to it when I have a better connection.