Full screen ads?
I've already got them on a couple apps I use regularly, I guess they must not be using iAd? I'd be more concerned about this if it hadn't already been happening for a while.
I just hope the app writers realize that if I see more than a simple full page ad that comes up only at startup time and can be quickly dismissed, I'm going to be scouring the App Store looking for alternatives about 1.5 seconds after the ad fills my screen!