Lost Notebook
From the site: A collection of the evidence to support the viewers of ABC’s show "LOST"
No theories. No conspiracies. Just the facts.

The Fuselage
From the site: The Official Site of the Creative Team Behind LOST. Sponsored by J.J. Abrams

Lost TV
Unofficial fansite with news and updates, pictures, transcripts, links and more.

Lost Theories
Read, rate and comment on others theories, or add your own.

Lost Media
Fan site with news, character and episode guides, forum, pictures, and audio and video clips.

Lostpedia ...The Lost Encyclopedia
Extensive Collection of Lost links, articles, dicsussions news, info and more!