Monte Cook: This is the Site of the game designer Monte Cook, if you don't know who Monte Cook is you need help.

http://www.montecook.com/

Wizards of the Coast: To be quite honest, this is one of the best resource sites on the net. They have alot of Web Enhancements to go along with your campaign, or to help you get started with new ideas.

http://www.wizards.com/dnd/

Spell Sorter: This is a pretty awesome site if you like playing a spell caster but hate having to look at the PHB everytime you look at a spell. Here it is set up simple and ready to print. The program is Java Based and written by Mark Shute. It has everything from the PHB to the latest Forgotten Realms spells and the Prestige Books too!

http://www.wam.umd.edu/~cadre/dd_spell/

RolePlayingMaster (RPM): this is the Site for the Software that is in continual Developement for the 3rd Ed D&D Game they also have an add-on for d20 Modern. Best of all, right now its Free for Download.

http://enworld.cyberstreet.com/hosted/rpm/default.htm

Mortality.Net: This is one of those hidden gems of the internet when it comes to d20, or any D&D version you play. It is probebly one of the best resources for DMs I
can think of besides WoTC.

http://www.mortality.net

PCGen: this is another cool program, but it has a bit of alearning Curve to adjust to, thus far I like this one best for generating characters for virtually ANY d20 campaign setting.

http://pcgen.sourceforge.net/

The Official Neverwinter Nights: This is the premire site to visit for information on NWN. If you have perchased NWN besure to register your CD Key and you'll have access to alot of information and News before it is
available to the public.

http://nwn.bioware.com/

Neverwinter Vault: This site is Huge, HUGE I say... it is a big basin to which user created Modules fall helpless into and collect among the THOUSANDS that already exist there. I absolutly love this site, they have Everything you could want for NWN; Modules, Scripts, Hak files, Tutorials, Screen Shots, artwork Module Reviews... I'm telling you this site is Huge and its nice because its full of Fan and Bioware created content.

http://nwvault.ign.com/

Montlethia: this is the Website of a brand new persistant world for NWN. Montlethia: Under Siege, I am currently one of the beta Testers and you can see some of the progress they have made just in the first couple weeks.
you can also see some of my Beta Reports posted there
as well. Take a look spread the word, if your into NWN and like a friendly atmosphere go check it out... if you sign up mention I sent you.

http://www.montlethia.com/index.html

City of Doors Initiative: This is a cool group whose entire goal is recreate Planescape for NWN. They have come up with some of the most graound breaking add-ons for NWN that I think are pretty impressive. If you liked Planescape and you like NWN then I think you'll appreciate this site as much as I do.

http://www.city-of-doors.com

Amathia: This is the site for a friend of mine who runs a Free Form Roleplaying chat room and Messageboards. The world is based on the fantisy genre. Very cool site and alot of cool ideads for her world of Amathia.

http://www.amathia.net