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.
Take a look to these articles: Using Speech Synthesis in a WPF Application; System.speech code samples.
An interesting article by Andrew Kirillov can be found here, on “The Code Project” web site. The article shows how to build a C# application which allows monitoring several IP cameras simultaneously. The source code is available to download. By the same author: Motion Detection Algorithms Image Processing Lab in C#