CW - Veronica Mars:Official network site. Includes a photo gallery, case files, character dossiers, Veronica's diary, and "Ask Veronica" column.
Get Clued In: A Veronica Mars Fan Site: News, fan art, episode summaries, and video clips.
IMDb: Veronica Mars: Cast, crew, and production information.
LiveJournal.com: Veronica Mars Fans: Multi-user weblog with links, spoilers, and news.
Mars Investigations: A Beginner's Guide to Veronica Mars: Character sketches, episode summaries, music listing, timeline, and clues about mysteries.
Neptune Central: Cast and character biographies, music list, FAQs, weblog, and message board.
Neptune Notebook: Delving into the mysteries of Veronica's world. Both long-term story arcs and "Mystery of the Weeks" are profiled.
NeptuneSite: News about cast, crew, and scheduling. Spoilers for upcoming episodes.
Planet Mars: Show, cast, character, and episode discussion.
Sucker Punch: Episode recaps, comments written in the voice of Spike from Buffy, analysis of the season long mystery, and Logan's diary.
Thrilling Detective: Veronica Mars: Review with comments on how the show fits in the detective genre.
TV.com: Veronica Mars: Episode guide, cast and crew information, and images.
Veronica Mars Filming Locations: Details and directions to various filming locations in San Diego.
Veronica Mars for Newbies: Background information on characters and plot lines.
Veronica's Addressbook: Web site directory with reviews.
Veronica-Mars.org: Episode guides including cast and crew lists, postcards and games, forum and gallery.
VMUK - The UK Home of Veronica Mars: News, pictures, episode guide, forum, fanart and cast information.
Warner Brothers: Veronica Mars: Official WB site with cast and crew information. [Requires Flash]
Wikipedia: Veronica Mars: Show summary, cast and character information, episode list, ratings and production information.