Work on reputations

Could somebody please forward me references to existing reputations-based systems, and discussions of them? I read cyphernomicon and some texts on and off the Net, but I assume there should be a lot more. --------------------------------------------------------------------------- Alexander Chislenko <sasha1@netcom.com> www.lucifer.com/~sasha/home.html Firefly Network, Inc.: <alexc@firefly.net> www.ffly.com 617-234-5452 ---------------------------------------------------------------------------