Agreed. Well, with the date, anyway ;-) (though I am an SBCL user) Somewhere around 2000 we saw the end of AI winter. This most likely owes something to the fairly impressive Lisp marketing that PG did. Within a few years, several new Lisp books came out, and a few years after that we saw what the other poster mentioned: but not Just Clojure, a plethora of Lisps. To mention just a few: Clojure, Liskell, and LFE (LFE was actually started in 2007, first released in 2008). To the best of my knowledge all of these were completely unknown to each other at the time of their inception, and thus indicative of probable momentum in the wider Lisp community from an earlier time, possibly the once-again-growing acceptance of Lisp that started ~2000.