Dario Airoldi has written an interesting article about this subject.
Take a look at these posts by Jaime Rodriguez:
I’ve found some useful articles about WPF Web Browser applications and their deployment using ClickOnce:
- XBAP & Trust Levels by Karen Corby;
- Creating A Full Trust WPF Web Browser (.xbap) Application by Karsten Januszewski.
If your application needs Full Trust with a self-generated certificate, remember to install it in the Trusted Root Certificate Authority.
Read this article from David Chappell which introduces the main characteristics of Windows Presentation Foundation.