Tracking in After Effects has always been a bit of a dark art with a few different options to choose from. There has always been the inbuilt tracking tool and Mocha Pro.
However, a new tracking plugin has been developed by Chris Vranos called lockdown. This is a very intelligent tracking system for warped surfaces. Check out the promo below and a review below that.
Below is a Lockdown review from Joe over at Workbench.tv. Its very insightful and always great to hear a users thoughts. Good work Joe.