I have been using psake, the amazing PowerShell based automation tool by James Kovacs, for builds since discovering how awesome they are while working with the Russell Boys. I have a stock set of build scripts that I seem to copy and paste and modify as needed on each new project.
Ian Davis posted a demo video for his recently released build system Toji.Toji pretty much implements all my build goo in a nicer, cleaner way, but also makes it super easy to set up via Nuget. I think I will be using it from now on and contributing stuff I need to the project. Awesome.
Check out the demo video.