I wonder if I can automate WPI actions to setup a dev box in unattended mode, either with command line options or a configuration file. It looks like WPI takes a "URL" as a command line parameter but I have no idea what format the response should be in, and what it allows in general.
EDIT: Thanks folks for the huge effort to come up with ways to automate setups. As @fra mentioned now there is a command line tool for WPI.
WebPi Command Line was just released:
http://blogs.iis.net/satishl/archive/2011/01/26/webpi-command-line.aspx