Apparently, hot from the oven:
My only complaint is that setting up external rails commands is rather tedious and commands have no guard rails (sorry) due to command line level integration with Eclipse.
NOTE: I am not completely sold on Ruby nor Rails. I am playing around with Ruby on my breaks just to get the bitter taste of real world engineering out of my mouth.
WEBrick is usually shut-down with control-C but since it is launched as a Eclipse external tool, it has to be shutdown directly from the Eclipse Debug view.