Faviki is a social bookmarking tool that lets you use Wikipedia concepts as tags. Faviki allows you to keep your own tags and connect them to common, universal concepts from the world's largest collection of knowledge!
D. Gifford, P. Jouvelot, M. Sheldon, and J. O'Toole. Proceedings of the 13th ACM Symposium on Operating Systems Principles, 25, page 16-25. Pacific Grove, California, United States, ACM Press, (1991)