I'm biased as I'm the creator of Whirl, but one my favorite 99-bottles implementations might just be this one: http://bigzaphod.org/whirl/kang-99.html And of course, there's the one I did for another of my silly languages, Taxi: http://bigzaphod.org/taxi/99.txt :) [edit: To clarify, I didn't write the one done in Whirl, that was sent to me by Kang Seonghoon.)