I was looking through codeproject.com the other day and ran across this article on building your own popup blocker (from start to finish) with C#. I haven’t tried this myself, but it looks like it would be a great intro to everything C# for anyone wanting to build a fully functional (and useful even) applicaiton from the ground up. It’s not going to help someone that doesn’t understand the language itself, but once you move beyond that and want to get into a pretty serious application without getting into too many details, this would be excellent.