Every once in a while, a company or group of people enter an industry (or create it) who are so far ahead of everyone else, so absolutely the best at their craft, that others stop even referring to them and just concentrate on doing the best they can compared the rest of the competitors. In this case, the industry was Text Adventures, and the company was Infocom.
Based in Cambridge, MA, and surviving for nearly a decade, Infocom was started by a group of MIT students who had worked on parsing out full sentences and having machines react properly. Whereas most games before infocom had simple commands like TAKE ROCK or LOOK, Infocom games let you work in full sentences, enabling you to type things like ASK THE TROLL ABOUT THE COINS and CLIMB ON TOP OF THE HOUSE. This great interface, combined with the year (or years) of work put into writing the descriptions and creating the puzzles, meant that you were riding on the best text adventure vehicle out there.
Infocom ultimately died as many companies do, with a few fatal business decisions and with a quiet disappearance, only to have its corpse propped up for a series of graphic adventures made by Activision. Regardless of its fate, this company was unique, and in the world of the 80x24 screen, they ruled supreme.
Solution to Infocom's Ballyhoo
Compuserve interview of Michael Berlyn (Creator of several Infocom adventures)
Beyond Zork: The Lore and Legends of Quendor by Z-Man
Tips for Beyond Zork by Erik Futtrup and Twan Lintermans
Walkthrough and Spoler for Beyond Zork by Infocom, by Big MAC
Zorker's Corner: An Overview of Infocom Adventures
Solution to Infocom's Bureaucracy, by Douglas Adams
Solution to Infocom's Cutthroats
Solution to part one of Enchanter
For Your Amusement: Deadline Tips and Tricks
For Your Amusement: Infidel Tips and Tricks
Have You Tried... (Suspended Funnies)
Have You Ever Tried.... (Starcross Funnies)
Have You Tried... (Witness Funnies) by the Wyvern
Fun Stuff with Infocom Adventures, by the Wyvern
Walkthrough for Infocom's Hitchhiker's Guide to the Galaxy
How to crack Apple II Infocom adventures using a "ROM Switch".
Solution to Infocom's Leather Goddesses of Phobos
Solution to Planetfall, by Infocom
Return To Zork: Almost-Full-Point Solution
General Infocom Statistics by The Gunslinger
Solution to Infocom's Stationfall
Solution to Infocom's Wishbringer
Pretty amazing ASCII Wishbringer map
How to Solve Zork I: The Great Underground Empire, by Screwy Luey
Solutions to Zork 1 by Infocom
Solution to Zork II by Infocom
Solution to Zork II by Infocom
Solution to Zork II by Infocom
Solution to Zork III by Infocom
Solution to Zork III by Infocom
Solution to Zork III by InfoCom
Walkthrough for Zork Zero by Activision
Collection of Solutions to Zork I, by Infocom
A Walkthrough for Zork I by Barbara Baser (1984)
"The Great Underground Empire: A History" by Froboz Mumbar
Walkthrough for Zork I through III
Solution to Zork II, by The Doctor
A Walkthrough for Zork II by barbara Baser (1984)
Collection of Solutions to Zork III, by Infocom
A Walkthrough for Zork III by Barbara Baser (1985)
Solutions to all of the Zork Series (I, II, III)