I've had about 60 odd people try out my game (according to my server logs). 3 people stuck with it for around 30mins to make it all the way to the 4th car.
Nate: As the users can't keep the apps (the ADC app deletes them when the rating is entered), I went ahead and submitted my paid version (breaking the circle of trust for a second time
I've been skipping a _lot_ of apps. I actually got one app that told me how to find the closest toilet, then a few apps later, a different app to find the closest toilet...
Still haven't gotten Sing Song yet. Looking forward to belting out a few tunes!
Edit: Just got Sing Song. Rocked out to a bit of Green Day. Awesome! Just one little thing missing, a PowerManager.WakeLock. I kept having to touch the screen to stop it sleeping.