PostCapitalism

http://www.digicash.com/ : David Chaum's DigiCash

http://nii-server.isi.edu/info/NetCheque/ : NetCheque - an electronic payment system for the Internet developed at the Information Sciences Institute of the University of Southern California.

http://ganges.cs.tcd.ie/mepeirce/project.html : Network Payment Mechanisms and Digital Cash - A collection of papers, articles, reports, press releases, discussions, implementation tools, links to related sites, and more to do with Network Payment Mechanisms and Digital Cash

http://nemo.ncsl.nist.gov/ : NCSL

ftp://ftp.u.washington.edu/public/phantom/cpunk/mgmny.html : Texts on Digital Cash