Tour 890 Inline Skates, written by RJ Marquette.

About.com's page on Roller Skating clubs (actually, mostly speed/inline clubs, it seems).

Roller-Skate.org doesn't endorse any of the suppliers listed below. Also, we'd like to remind you that your local rink probably carries skating equipment.

Netskate, a business covering inline, quads, and accessories.

NewSkates.com, a business covering inline and roller skates and supplies.

Back Street Inline sells inline, speed, and ice skates and accessories. It's not a flashy site but they do seem to carry a lot.

The Skaters Junkyard is an exchange for used skates and parts.

eBay's Skateboarding & Skating category.

Nett Racing carries inline speed equipment.

Low Price Skates carries inline and quad skates.

SkatesNSuch carries inline and quad skates.

Southeastern Skate Supply is probably the most famous supplier to skating rinks. Note that they are wholesalers and therefore cannot sell to individual skaters.