LANParty.com

Extensive listings of LAN parties around the world. Information pages with date, time and location of the LAN party. News and updates of events, as well as special event coverage.
http://www.lanparty.com/

Tweak3D.net

A guide to host your own LAN party.
http://www.tweak3d.net/articles/howtolanparty/

Blue's News - LAN Parties

Listings of both one-time and regularly scheduled events split into United States and international categories.
http://www.bluesnews.com/cgi-bin/lanparties.pl

IntraLAN - Project Homepage

An intranet system for LANparties, using mod_perl, ssi and mysql.
http://intralan.sourceforge.net

MFA LAN Party Manager

Offers LAN party management software.
http://lanpartymanager.mfa-lan.com/

World Cyber Games

International LAN gaming tournaments, results, rules, FAQs and forums.
http://worldcybergames.org/

Adrenaline Cafe

A gaming center that provides LAN parties.
http://www.adrenaline-cafe.com

LANsurfer

Free and easy Internet/Intranet solution for your LAN-party. The software allows you to easily manage complex tasks like news posts, user registration, seating plans, tournaments and polls.
http://www.lansurfer.net/international/