File under: Reference
We were doing a little housekeeping on the discussion list and came across a link provided by longtime guru commentator, Jan Barendrecht. It's as much a guru 'bible' as anything we've ever found online. It's definitely somewhere to send people who don't quite know what you mean when you talk about gurus.
Update: A kind reader has pointed out that the Next Switch article is only a dated version of the Wikipedia article, which is an even better reference for those trying to understand the cultural extents of the phenomenon guru.