I've been working on a project that uses all .NET code to connect to the streaming api (HttpWebRequest & native JSON parsing). Several people have already released code samples and many of the libraries have this functionality, but I needed to build my own app. There were enough issues along the way that I decided my code might help someone else to get started. If you have any comments or suggestions, please leave them on the blog post.
http://www.voiceoftech.com/swhitley/?p=898 -- Subscription settings: http://groups.google.com/group/twitter-development-talk/subscribe?hl=en