I personally feel that the only reasonable uses and logically using a phone with a car for, is those programs that hook up to OBD II cars to check CEL and sensor information. I mean, I hate tuning the car with a little net book, let alone a fricken 3.5-4" screen. It would be useless in my opinion. On top of that, the CPU for a smart phone and a laptop are tremendously different, so logging is another story all together. Not trying to rain on anyones parade, but the only, and I mean only device that has a chance of being used for this worth while is a tablet. And maybe down the road when android gets there stuff together and has a decent tablet and mature OS, hint hint with Android OS3, then it would be worth it. Again, just my opinion.....