Design and Development

Brass Lantern Interactive Fiction Theory
The theory of adventure game and interactive fiction design, from elements such as puzzles to game analysis.
http://brasslantern.org/writers/iftheory/

Choosing a Text Adventure Language
Some handy tips about picking which language to use when writing a text adventure.
http://brasslantern.org/writers/howto/chooselang.html

Creating Adventure Games On Your Computer
The full book by Tim Hartnell.
http://www.atariarchives.org/adventure/

Exposition in Interactive Fiction
This document introduces the concept of exposition in interactive fiction, and offers three versions of the same brief interactive fiction text, so that you may experience interactive exposition for yourself.
http://jerz.setonhill.edu/if/gallery/exposition.html

Feelies.org
Company dedicated to distributing feelies for shareware and freeware interactive fiction.
http://www.feelies.org

Interactive Fiction and the Future of the Novel
An article by Michael Berlyn and Marc Blank.
http://www.atariarchives.org/deli/interactive_fiction.php

Interactive Fiction Page
Information on playing and developing interactive fiction.
http://www.cs.cmu.edu/afs/cs.cmu.edu/user/wsr/Web/IF/

NPC Characterization
A guide on how to create believable NPCs.
http://emshort.home.mindspring.com/NPC3.htm

OnyxRing
Covers topics from interactive fiction design to Inform implementation.
http://www.onyxring.com/

XYZZYnews: Interview with Michael Kinyon
Interview with a Player Extraordinaire.
http://www.xyzzynews.com/xyzzy.13d.html