To get a version of Blender that is capable of 2D tracking go to Graphicall.org and grab a build named "Tomato" or "Salad". Those are GSoC branches. Once you got them up and running watch the first tutorial by by Sebastian König. It guides you through the current tracking process and you also learn how to set up a simple 4-corner-pin.
The next tutorial is by Francois Tarlier. He uses a script to set up a few things you'd otherwise need to set up manually. Hope he will be releasing it soon. The tutorial shows you the Blender way to stabilize footage which is really easy to accomplish:
The third video is another one by Francois Tarlier. It shows how to use tracking data to help the rotoscoping process in Blender. It's called RotoTracking.