Undermountain again - second verse, same as the first.

As each edition comes to a close, WotC/TSR seem to have released an Undermountain product.  Undermountain is by no means the "baddest" of the classic dungeons, but perhaps one of the most extensive.  Ed Greenwood's house dungeon for his Forgotten Realms campaign was cool in a lot of regards.  It was entered through a tavern (meme upon meme!), the initial release was partially mapped - resulting in a product that a dungeonmaster got to really make their own, and it had a "boss" that served as a plot device - making it more than "kill the baddies; take their treasure." 

EnWorld.org has a review of the new 4th Edition work on their site, today.  Undermountain, Underdark, and other old classics seem to be the great last push done every time a campaign/rules-set are coming to a close.  I'm not sure why.  Maybe it's the realization that there's only one last shot to capitalize on all of that intellectual property.  Maybe we're all just still scared of the dark.