This year's Google Summer of Code brings some exciting new features.
One of them is Camera Tracking, which is currently being developed in the so called "Tomato Branch" by Sergey Sharybin and the guys from LIBMV, which provides the algorithms for the tracker. In this video tutorial you will get an introduction how to do supervised manual tracking and scene reconstruction of some HD video footage. But the development is so incredibly fast that by the time you see this tutorial there are probably already new features and it will be even easier to use the tracker.
If you want to make sure to keep up with development, it will be best to build the tomato branch yourself. See the links below for more information.
Or you use the easy way and download from graphicall.org.

Building Blender in OSX: blendercookie.com/2010/10/25/building-blender-in-osx/
Building Branches on OSX: vimeo.com/25567856
The latest tomato builds: graphicall.org/?keywords=tomato

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