Tools I've used to build a .NET continuous integration server:
- NAnt Contrib
- NCover (with additional custom templates)
- HTML Help Workshop (required for NDoc if Visual Studio is not installed on the machine)
- WiX (Windows Installer XML)
- Visual SourceSafe
For those of you who develop with VB.NET, VBCommenter is very helpful too.
As soon as I can I will add more stuff, mostly interesting NAnt scripts, but also some interesting tools, like Nester.