PriusChat: The most active online group
Prius Online: Less active, easier to navigate
Clean MPG: The place for saving gas in any vehicle
GreenHybrid: Database and discussionof hybrids
Personal Web Pages by Owners
John1701a has assembled personal data, much useful
information on the Prius, and lots of goodies like calendars
Hobbit (may the hair on his feet grow ever longer) has
hacked every possible system on the Prius, and has
contributed mightily to our understanding
of how its drive system works
More info
Memory Alpha: the United Federation of Planets encyclopedia