I can't say its a surprise, but my Ad Viewer application was rejected for minimal functionality. That's a fair statement, I spent minimal time developing it. While I think it would have been useful and done OK if Apple had approved it, I'm not surprised it was rejected.
The NDA has been released on iOS 4.0 it, so I'm publishing my blog articles. I'll post my code soon. I didn't publish my old posts in order, so there will be some confusion I think.