Not dense, but it's been a while.

If you look at

http://wordsmith.org/board/ubbthreads.php?ubb=showflat&Number=180924
you'll see a previous incarnation. (page down to 1/22/2009)

and another reference at
http://wordsmith.org/board/ubbthreads.php?ubb=showflat&Number=189797
has the mosst recent time it was offered. (page down to 3/6/2010)

I don't recall where the first mention of it was; likely a different thread but the same game.

And there's a way of getting directly to the post by its #, but I only know how to get to the top of the thread. Sorry.