Crime Scene Investigation
Episode, character and tool guides for the 3 series.
http://freewebs.com/csi_fan_site/

CSIguide.com
Focuses on CSI: Crime Scene Investigation and CSI: Miami. Includes news, articles, episode guide, cast information, message forum, and schedule of forthcoming episodes for Ireland, the UK, and the US. Registration required for forum.
http://www.csiguide.com

CSI-Search.net
Directory providing links to sites focusing on cast members, fan fiction, and each of the three series.
http://csi-search.net

AllStarz.org: Dispatch 404
Cast biographies, photo galleries, transcripts, fan fiction, and episode guides.
http://www.csi.allstarz.org/

Crimelab.NL
Contains an episode guide, quotes, facts, wallpapers, screen shots and message board for CSI, CSI: Miami, and CSI: New York.
http://www.crimelab.nl

CSI Files
Daily updated news, episode guides, a discussion board, and reviews on all the three shows.
http://www.csifiles.com/

CSI-Fan
Including the news, episode guides, cast biographies, and downloads for CSI and CSI Miami.
http://home.iprimus.com.au/emery_s/csi-fan/

European CSIforum
European forum dedicated to the three series. Includes schedule, episode guides, and cast biographies.
http://www.csiforum.no