FETBOT
FETBOT is an open directory for Fetish and BDSM sites.

DungeonNet
DungeonNet is a BDSM search engine and links directory.

DomSubFriends
In addition to DomSubFriends being a New York based BDSM group, their website also has many great BDSM resources including: a worldwide BDSM organizations directory, informative online articles in their magazine The Voyeur, a great BDSM resources links directory, and there are also some good articles in their online Library.

The Deviants Dictionary
This is an extensive online BDSM, fetish, and alternative sexuality dictionary online. Many of the definitions have links to additional resources.

BDSM? What? Why? How?
This site has some good introductory articles on BDSM.

Albany Power Exchange
In addition to the Albany Power exchange being an upstate New York BDSM community group, their website also has many great articles on a wide range of BDSM topics.

Ambrosio's BDSM Site
This is an informative site about BDSM, with many articles on various BDSM topics.

The Frugal Domme
This site has articles on various BDSM topics, toy making instructions, and BDSM links.

The Castle Realm D/s Resource Center
This site has many informative articles on various aspects of D/s relationships.

The Society for Human Sexuality
The Society for Human Sexuality website is filled with sex positive resources, including a variety of articles, reviews, and guides. Several articles on BDSM can be found in the contributed documents section.

T-Vox
T-Vox provides advice, information, and support for genderqueer, intersexed, and transsexual people, and their friends and their family.

ProDomination.com
This site provides a guide to resources for Professional Domination.

National Coalition for Sexual Freedom
The National Coalition for Sexual Freedom is a national organization committed to creating a political, legal, and social environment in the United States that advances equal rights of consenting adults who practice forms of alternative sexual expression. NCSF is primarily focused on the rights of consenting adults in the SM-leather-fetish, swing, and polyamory communities, who often face discrimination because of their sexual expression.

San Francisco Sex Information
San Francisco Sex Information is a free information and referral switchboard providing anonymous, accurate, non-judgmental information about sex. Their website has answers to frequently asked sex questions, it also has their toll free phone number, and the hours they receive calls. Call them if you have a question about sex, and they will either answer it or refer you to someone who can.