Here are some links to other great Street Fighter sites.

Contains all kinds of Street Fighter related info and trivia, and also hosts the Street Fighter plot guide -if you want to know what goes on in the SF universe, read it.
A well known fighting game site, be sure to check out the Super Turbo guide they have there.
Combo videos, challenges, interviews and much more cool stuff. Check out their Youtube channel here.
This site has a master guide to nearly all Street Fighter games released in America, and games related to the series, among other things.
Street Fighter Galleries
Has sprite rips of character portraits and scans of a lot of official art.