Hi,
Me and a friend have spent a lot of our spare time creating a simulator where it is possible to find the best possible race line at any track accessible from Google Earth. Job split has been me doing all the calculations and my friend doing all the ciomputer stuff. (For me a computer is a strange thing when it is not connected to the ECU).
To my knowledge there are no other similar tools for simulation of the effect of different parameters when riding at track. It's for the analythical nerds but if you are one of those I would guess you will like it. There is an article about it on the homepage, unfortunately in Danish, but Google translate makes it readable.
Check: www.fastestlapcalculator.com
Brgds
Henrik