Shops
Their specialty is awesome strap-on harnesses, but they also have some gorgeous restraints. And, of course, a nice selection of strap-on compatible dildos.
A fantastic selection of medical toys, restraints, uniforms, and equipment PLUS an informative medical fetish library - all of which is interspersed with great photos and fantastic sense of humor.
A fun, female-friendly purveyor of fine sex toys, bondage gear, fetish wear, and more. They're worth a visit for the hilarious little comics at the top of each page alone.
Ponyplay
Graphica Design (spandexwear.com) - If you're looking for spandex, this is the place to go! They've got everything from bodysuits to pillowcases, and even animal suits with built-in ears and tails. They have a wide variety of colors and prints to choose from and custom sizing is available so you can get the best fit possible.
The Water Hole Custom Leather - Fully customizable, handmade leather restraints, collars, harnesses, etc. Specializing in pony gear, including hoof boots.
Equus Eroticus - The online companion to the well-known magazine. You'll find lots of great articles and information, including a directory of ponyplay terms and a DIY guide. There is also a forum, but alas, it seems to be rather dead...
How to Make a Field Halter for Human Equines - Instructions for a simple nylon halter.
How-To's
Bondage U - A nice intro to basic bondage, including safety, scene negotiation, and simple rope ties.
Symtoys - Basic bondage info, DIY toys, and scene ideas
Information
The "Newbie Pack" - Lots of practical information for anyone new to BDSM, including terminology, safety, frequently asked questions, and sample contracts.
The Slave Register - Nifty site where you can register your slave/submissive and get a printable ownership certificate, which includes a registration number and barcode.
Miscellaneous
Open directory for Fetish and BDSM sites.
The Slave Register - Nifty site where you can register your slave/submissive and get a printable ownership certificate, which includes a registration number and barcode.