I'll start off with this gem of a production from the BBC:

Batman: Knightfall (BBC) - the entire Knightfall saga. A must for fans of Batman



As one .rar file (http://rs279.rapidshare.com/files/82665573/audio_batman_-_knightfall.rar)

As each separate MP3 file:

Part 1 (http://www.4shared.com/file/33658580/fb82936a/BBC_Batman_Knightfall_01.html)

Part 2 (http://www.4shared.com/file/33659194/5a41a98b/BBC_Batman_Knightfall_02.html)

Part 3 (http://www.4shared.com/file/33660964/e962d1a6/BBC_Batman_Knightfall_03.html)

Part 4 (http://www.4shared.com/file/33662163/d31cdd36/BBC_Batman_Knightfall_04.html)

Anyone have any others that you'd like to share with us?