Here’s a nice set of paper model walls, columns, corners and stairs for constructing your own Mines of Moria.
The Encyclopedia of Arda is an illustrated online hypertext encyclopedia of Tolkien’s worlds.
War of the Ring: The Lord of the Rings- Strategy Battle Game is a relatively expensive rules set from Games Workshop. But if you already have a set, you may be interested in these houserules.
Lord of the Rings Express is a free print-and-play game based on the cooperative Reiner Knizia game. The express part is that it plays in a more streamlined, faster fashion without apparently losing the feel of the original.