Less than three weeks ago I dipped my toe into the collaborative waters of "Let's stock this dungeon together!" I'm pleased to say that the response was immediate and enthusiastic.
This is the map I prepared (beware, the rooms have been renumbered since):
I opened a Google doc to the world, and thirty people picked rooms, described them and the stuff inside. From their descriptions, I made 3D illustration of the place:
..and now you can get the contents in a 48-page, 6x9" book from Lulu. It's an at-cost offering.
Inside, it looks like this:
EDIT: It's also up on DriveThruRPG as a PWYW PDF.
As always, all this stuff is released under CC-BY-NC. Have fun!