Genghis is a project that builds a set of extensions on Windows Forms. It has just been updated to work on .NET 2.0.
Genghis is directly responsible for my blog and some of the success I have had as a programmer.
I first encountered it when I was looking for a simple way of implementing a splash screen and a pop up toast box. From this I was lead to Chris Sells who was blogging. I was stunned to find someone with inside knowledge and massive skills making everything available to me! I think this was the first post I recall, but time may be playing tricks!
So thank you Chris and if you need some very cool controls check out Genghis.