Here's a short video I put together using TF's playback and some helmet cam footage.
GPS playback + Helmet Cam from Scott Morris on Vimeo.
I did it by using a free screen capture program called CamStudio. Then I combined the helmet cam and TF playback (with stats such as speed, grade, etc) in a video editing software.
Not a turnkey solution, but it didn't take that much work either, and others do the same, including some professional folks.