AC Character Templates help you to design characters better suited for the style of fighting you like most.
Asheron's Compendium, the source of the AC Explorer database, has nice details on locations, shops, portals, etc. AC-Spedia Cartography provides a Web resource of Dereth locations using the same database.
Asheron's Call Maps is the prime spot for Dungeon Maps. This site and Maggie link to each other to provide a great source for dungeon needs.
Asheron's Lore contains a good Dungeon Maps section, quest information, and a number of other useful tidbits.
CoD @ XRgaming: CoD has a large reference base of information on the specifics on Asheron's Call. You can also find a list of AC trophies and crafters at CoD. It's like that is all they do is document everything in the game!
Culinary Institute of Dereth: Information on cooking, fletching, alchemy, and tinkering. (formerly Cooking with Caspain & Caleigh the Chefs of Harvestgain) However, you might notice they no longer even have a cookbook and the site has been stripped to the bone. For another source of recipes try Warcry's Crossroads of Dereth Cookbook. Don't forget to try our cooking page too for some help. (For a little fun try this CoD Wish List Cookbook, they are not real recipes [yet] :)
Display Options @ Stratistics provides helpful, and little known, video display options to help your gaming. Reducing your display settings can improve the game speed, or increasing it can extend your vision. The AC Stratics site also has some other game details that may be of interest.
The Lost Dungeons Society: provides a list of all known dungeons and details on each.
The Fan Sites page provides a huge list of public sites dedicated to Asheron's Call: Dark Majesty.