Today sees the launch of the Streets of Rage Compet-N World Championships, a new ongoing tournament hosted by Streets of Rage Online which will determine who is the world's greatest SOR player! Check it out, and if you think you're good at playing the SOR games, then prove it by getting involved and entering the championship! Who will be crowned the Streets of Rage World Champion 2010?
Click Here for more details.
http://www.streetsofrage.net/index2.htm
In the meantime, though, why don't you check out the main site itself? It is loaded with almost everything Streets of Rage Related you could ever think of and more.
http://www.streetsofrage.net/index2.htm
Also, if you like, you can always register at the forums there and discuss your opinions on/experiences with the SoR series.