I love Build Radiators. The ability to pass information to a team of developers easily and immediately is far and above one of the most important things any CI method needs to do. (Apart from manage the whole Continuous Integration model)
Ever since we plugged in the Continuous Integration tool that is TeamCity I have been totally immersed in the world of Build Radiators, otherwise known as Build Status Screens or Build Notifiers (or the big red light that flashes whenever a build fails).