ACM SIGACT
Special Interest Group on Algorithms and Computation Theory, the ACM special interest group for Theoretical Computer Science. Site has membership information, meetings, reports and a newsletter for members.
http://sigact.acm.org/
Dictionary of Algorithms and Data Structures
Definitions of algorithms, data structures, and classicalComputer Science problems.Some entries have links to implementations and more information.
http://www.nist.gov/dads/
