Here are some prize winning articles on codeproject. Very nice articles.

1. Asynchronous Code Blocks http://www.codeproject.com/cs/library/AsynchronousCodeBlocks.asp
2. Camera Vision - video surveillance on C# http://www.codeproject.com/cs/media/cameraviewer.asp
3. An Introduction to AJAX Techniques and Frameworks for ASP.NET http://www.codeproject.com/Ajax/IntroAjaxASPNET.asp
4. List on codeproject http://www.codeproject.com/script/competitions/monthly/winners.asp