I just wrote a big post about how to open up a UIWebView overtop of the unity game engine. This is a good way to add Playhaven integration to your app, as we are doing with Snowferno. Anyway, I posted it on the Snowferno development blog:
http://www.snowferno.com/2009/09/23/playhaven-unity-and-snowferno/
Check it out if that sounds like something you might want to do.
Cheers!
-B
