If you'd like to add a link just send me an e-mail .

General Links

necromancergames.com The official Necromancer Games website.
wizards.com/dnd The official D&D site.
swordsorcery.com The Sword & Sorcery Studios website. Go here to get  all the latest S&S-info, the Necromancer Games forums and online RP-ing .
rpgplanet.com/dnd3e The best 3E site on the web. Alas, it's closed now.. :(
The Creature Catalog Creature conversions and original creatures, this is the one-stop creature resource site.
The EN World Site, for Resources, d20 Reviews and The Daemonforge world. They've got an automated review system for almost every d20 product, so you might stop by and rate or review a necromancer-module. .

Realms of Evil Games, a stunning resource site exploring the darker side of D&D.
Blurred-Vision.org A D&D 3e campaign site, pretty cool if you ask me !
Karathis Information If you dig the world in which the Fiery Dragon modules are set, you'll absolutely love this website.
The Ishka Campaign page , a campaign page that incorporates some NG material.
The Random Megacore, some very nice resources (esp the DM-screen). This is Roy Random's website ( the guy who did the RA1 floor plans in the resources-section).
RPG Blues, the website from the monthly Dragon-mag strip.

Free D&D Resources

There's a lot of good free stuff floating around on the web, here are some of the links I found, I'll try to add more soon..

necromancergames.com The official Necromancer Games website has some great free stuff, but hey you already knew that !
wizards.com/dnd/DnDDownloads_classics.asp The classic download page at wizards.com .
geocities.com/TimesSquare/Chasm/9223/  Free Dungeon tiles ! Great stuff...
http://tfwoods3.terrashare.com//portraits.html Pc-portraits I think they're very good.