Or as I like to call it: the Caves of Chaos on acid....
This plus Tharizdun plus Ravenloft, in Transylvania, were the backbone of my college/grad school game. Good, good times. But I did weary of the caverns eventually, and worked to put more "story" in, as was the fashion of the time (and that it really needed).
Would love to run it again with a fresh eye. After running many of the other things reviewed here, of course.
Great review again, [MENTION=3586]MerricB[/MENTION].
Actually, I would love to see an adventure you have written if you have any.