WarCraft III - Reign of Chaos

BellaOnline: WarCraft III Walkthrough - http://www.bellaonline.com/gaming/w/warcraft3/
Provides a walkthrough including information on each mission.

eWarcraft.com - http://www.ewarcraft.com/
Provides downloads and a forum.

Filefront - http://www.warcraftiiifiles.com
Offers maps, patches, and modifications to download.

Planet WarCraft - http://www.planetwarcraft.com/war3/
Offers news, clan directory, forum, and downloadable missions.

Title - http://www.wcmillennium.com

WarCraft III - Ladder Stats - http://www.benziegler.com/scripts/LadderStats.dll/
Provides statistics for WarCraft III players online.

Warcraft III Campaigns - http://www.blizzplanet.com
Frozen Throne screenshots and strategies, along with WC3 history, walkthroughs, modding information, and map news.

Warcraft Reloaded - http://necromanthus.com/Games/ShockWave/warcraft.html
A ShockWave demo of Warcraft 3.