I'm already maintaining Tripcode (almost all the text there is mine, although not logged in), but haven't be bothered to document the 2ch trip algorithm, especially since there isn't an article on DES hashing.
http://en.wikipedia.org/wiki/2ch?
(kareha bug I just noticed posting this: if you click a post number to generate a >>X and there isn't a newline at the end of the post, it should add one)