@Blue Ink:Well at the end of the day the best way to avoid obnoxious adverts will still be not to use apps that use obnoxious in-app advertising. As long as they don't start showing up in the default apps, I don't see them being any more of an issue than you get on the web today (or in some apps - WLMessenger for example).

As unfortunate as it is, the fact people aren't prepared to pay for software too often means we're likely to see more and more ad-sponsering as times goes on. See TV as proof.