http://sites.google.com/site/easylapcounter/
Easy Lap Counter is simple way to track your R/C races. It uses a standard external web camera to watch a section of your track for movement. Moving cars are recognized by color, and laps counts and lap times are tracked.
Easy Lap Counter is free to use.
Requirements:
* 1.6GHz (or faster) PC
* Windows XP, Vista or Windows 7
* .NET 3.5 SP1
* External web camera and mount (tripod)
(I've not tested ELC w/ dNaNo's since I don't have any. dNaNo drivers w/ home tracks, please let me know well this works for you.)