Streets of Rage 4 - The official site for Streets of Rage 4

Bombergames - A remake of the classic SOR games for PC - official site.

Wikipedia - Streets of Rage - Wikipedia's excellent SOR article

Ancient - Ancient's website. It's mostly in Japanese although there is an English section (with some bizarre translations). The best thing about the site has to be the fact that Yuzo Koshiro posts on their message board quite frequently, so if have any questions for the electronic musical maestro it's the perfect place to visit.

The Cookbook Gaming Blog - Blog from award-winning games journalist Dave Cook (from Games™ magazine). Check out "The Week of Rage" and "Week of Rage Stage 2", a series of articles on the SOR series, its history and its fanbase.

Extreme Disaster - Ever wanted your very own Streets of Rage action figures? Take a look how this guy made Axel & Blaze, as well as a whole load of other characters.

CustomCon 22 - Check out this brilliant custom-made Axel Stone action figure!

GameFAQs.com - Streets of Rage - GameFAQ's section for the first game.

GameFAQs.com - Streets of Rage 2 - GameFAQ's section for the second game.

GameFAQs.com - Streets of Rage 3 - GameFAQ's section for the third game. I post quite a bit on the discussion board here.

Streets of Rage France - French SOR Community

Streets of Rage series resource (squidoo) - A page designed by shanktoofs detailing many aspects of the SOR series and community.