Please do not Airpush. Users hate it and apps are almost guaranteed to get one-star reviews because of it.
Until I installed my app and experienced what they consider advertising. A cloned google search icon called "search" on my home screen that brings me to some scam site? woah. I'd be embarrased to tell people to go get my app, so I don't think it's worth it.
Time to switch my app's free version to AdMob.