The author would like to thank all of the researchers in the Future Computing Environments (FCE) Group in the College of Computing and GVU Center at Georgia Tech. Their abundant energy, enthusiasm and sweat have fed the ideas expressed in this paper as they have germinated over the past few years. Further information on the research of the FCE Group can be found at http://www.cc.gatech.edu/fce. This work is sponsored by the National Science Foundation, through a Faculty CAREER grant IRI-9703384 and by DARPA, through the EDCS project MORALE.