"The Lurker's Guide is a volunteer effort encompassing documents maintained by many Babylon 5 fans, as well as a lot of original material not found elsewhere. It's not associated in any kind of official way with the show" 
The Lurker's Guide was started before the original airing of The Gathering. It is an unofficial guide to the Babylon 5 universe. It collects a lot of information that would otherwise require exhaustive searches or be otherwise unavailable. J. Michael Straczynski has commented that the site has been an "invaluable resource" for him.