Does iPod touch have gps? If so there is one called Max Speed which is good for speed readout, altitude and it has a peak hold feature so it'll show your maximum speed. There are multiple lap timer apps but the good ones are pricey. Dynolicious is good, I have it. I don't use it so much for the kw reading it gives you (car is properly dyno'd so once I get it back it'll be interesting to see how accurate it is, I've heard it's quite accurate) but it has a nice lateral g meter and displays quarter mile time and 0-100 kph time. That one was 15 bucks I think. Don't know if you can use it on touch, works great on my iPhone 4 though