Here is an article about single sign-on (SSO) using ASP.Net and BlackBerry Devices.
Ther writer worked on a lot of concepts into the article, the following being a small sample of the variety.
- Cookie authentication
- Kerberos S4U2Self implementation
- Custom .NET configuration section
- Application of the Page Controller and Intercepting Filter (and why it's so cool for IIS 7) architecture patterns
One of the cool takeaways included in the sample code is a method in C# that simulates ASP.NET's Active Directory authorization check.