This Wednesday, February 20th, I will present on OpenID (using Ruby on Rails specifically), a decentralized single-sign-on system now used by Google, Yahoo, Microsoft, and the rest of the world. See http://en.wikipedia.org/wiki/OpenID for all the juicy tidbits/history/etc.
Wednesday, February 20th
electronic classroom in the Science and Engineering Library, Clark Hall. (http://www.virginia.edu/webmap/ACentralGrounds.html)