I have a speed puck but for race analysis I really like the Kattack approach:
1. Uses cheap GPS (does not work with Speedpuck)
2. Everyone turns in their unit so you can see how you compare to other racers. You learn a lot more than just looking at your own tracks.
3. You can upload the races to the web where anybody can watch them.



Velocitek has their own priprietary software that does the same thing, but it supports only the velocitk units and I don't think there is anyway to upload to the web.

Kattack is good for a club or people that regularly race against each other.