Automation Technology Laboratory (Aarne Halme's group) at the Helsinki University of Technology, where Andy Ruina spent the 1997-98 academic year
BIPOP Team at INRIA, where they also do work on passive models
Matthew Berkemeier at Utah State University
http://www.aerovelco.com. (Tad McGeer's current work), where they build small autonomous planes. One of his previous planes crossed the Atlantic in the summer of 1998.