There are a wealth of websites out there to keep any X-Phile busy for days. You can explore fan sites, read conspiracy theories, learn about David Duchovny and Gillian Anderson - the show's main stars - and more.
Remember, "the truth is out there."
Fan Sites
Duchovny.net - An unofficial site dedicated to information surrounding David Duchovny.
InsideTheX.co.uk - A site featuring complete transcripts of every episode of both of The X-Files and The Lone Gunmen, as well as the first movie and some DVD commentaries.
Red Wolf's Episode Guide - Features tons of snippets from each episode with TV Guide-style synopsis. Entire guide can be downloaded as a PDF.
SciFi.com X-Files Forums - Active forums for devoted and casual fans of the series.
The Science Behind The X-Files - A site that discusses the scientific realities behind some of the show's science-heavy episodes.
TheMareks.com - A detailed timeline of the show, the characters and major events the series discussed. Also has a guide to the alien conspiracy that ran throughout the series.
X-Files 101 - Makes it easy for anyone to jump into the X-Files phenomenon, even at this point in the franchise's history.
X-Files Screen Grab Archive - Hundreds of screen grabs from every episode through the eighth season.
X-Files Wiki - After nine seasons on television and two feature films, you need a wiki just to keep the alien conspiracy straight.
X-Files.gr - Though it is is based in Greece it is also available in English and features episode notes, Winamp skins and more.
X-Files.host.sk - An enormous fan site with all of the usual trappings such as episode guide, character guide and so on, and the most amazing list of in-jokes I think I've ever seen on a fan site.
XFilesNews.com - The only fan site to be authorized by 20th Century Fox to cover the second movie.
XFilesUltimate.com - An active fan site with reviews, guides, highly trafficked forums and more.
XFRoadRunners.com - Has a nice multimedia archive of clips from seasons 8 & 9 of the series, The Lone Gunmen spinoff, personal appearances and more. Also has transcripts, humor, episode guide and more.
Official Sites
AllThingsAnnabeth.com - Official fan site of Annabeth Gish who played Special Agent Monica Reyes in the ninth season of the series.
BBC Official Site - Though they are no longer updating the site, the BBC site still has lots of information and photos for fans.
BillyConnolly.com - The long time comedian plays Father Joseph Crissman in the second movie, X-Files: I Want To Believe.
GillianAnderson.ws - Official website of the actress who portrays Agent Dana Scully.
XFiles.com - Official site of the popular series, now featuring information on the second movie.
XFilesFanClub.com - Official fan club of the series about paranormal investigations.