Artificial Languages: An essay on the nature of artificial languages, by Robert Isenberg.
Conlang Archives: Large searchable archive of the conlang mailing list.
Conlang Yahoo: The signup page for the Yahoo.com Constructed Language mailing list.
Constructed Languages: Online community for all those with an interest in conlangs and their invention. With extensive information on scripts and writing systems.
Conversational Maxims and Principles of Language Planning: Scholarly article on brevity, ambiguity and redundancy in planned languages, by Hartmut Traunmüller.
Essays on Artificial Language Design: A collection of writings on language design by Rick Morneau.
How to Build a Language: A general overview of many constructed language. Introduction with personal analysis and conclusions.
JBR Homepage: Articles and rants related to Language Creation, many with a humorous twist.
Lang Game: by Decker: Language creation game presided and run by Decker. Five phases. Details to join.
LangMaker.com: Invent your own language resources with FAQ, links to other languages and book list.
LanGServices: Language Creation: An online textbook for creating languages.
Language Construction Kit: In-depth introduction to language creation, by Mark Rosenfelder.
Optimal Auxiliary Language Guidelines: Revised edition of an article discussing the design factors to be considered in creating an artificial language for global communication.
Semantic Space Theory: Research in coordinate semantic space (notion space) theory and its applications.