NovelsThere are several Descent³ novels in your local bookstore, written by Peter Telep (who also wrote novelization of Space: Above and Beyond, and Wing Commander: The Movie, among others)
TrailerThe 1st disc came with a trailer for the late lamented Star Trek: The Vulcan Fury game. This was to be the ultimate trekkie adventure game, complete with a script by Trek author DC Fontana. The game used photorealistic renders of the cast of TOS. You could even see the drawn eyebrows on Spock! For some reason, Interplay canceled this game.
Information also contributed by Scott Monster