Just started looking to implement CruiseControl.Net with our projects at work.These guys have more documentation than Draco.Net and the community looks a bit more active.

It's very easy to configure and the install is really quick without having to do any tweaks at all!

It uses XSL to transform log files created by various other apps you can call e.g. Nant and VSS.

I've already got 3 projects running in it using VSS and Nant with some nice build scripts that register COM objects written in VB6 which are grabbed from source control, built and registered.