(Unofficial) Infocom Homepage: The definitive homage to the company that created some of the best adventure games ever.
Adventureland: Infocom: Contains information about many of Infocom's classic games.
Classic Infocom Games Revived: Success story of the company, downloads and information.
Down from the Top of Its Game: 50-page research paper and slide presentation on the history of Infocom, Inc.
GameOver Retrospective: Infocom: The history of Infocom from the creation of Zork to its fall in 1989.
Infocom: Describes the games, box art and promotional material.
The Infocom Bugs List: Lists of known bugs in Infocom games by Graham Cree.
The Infocom Documentation Project: An Activision-sanctioned project to recreate all of Infocom's original documentation as closely to the originals as possible.
The Master Storytellers: Provides company history, game descriptions, downloads, and a buying guide.
Washington Post: Through the Zorking Glass: Home Computer Games to Plot Your Own Adventure
XYZZYnews: Matt Newsome interviews Marc Blank, Dave Lebling and Steve Meretzky of Infocom fame.