More links to scrolling beat 'em up sites wanted -send any to:

Name
Comment
Alien Vs. Predator Lair
 
Boulevard 64
A large gaming site -there are articles about scrolling beat 'em ups, but there is also a lot of other content which is well worth checking out.
Capcom
Capcom's official site.
Capcom Wiki
 
Death Adder's Castle
A site about the Golden Axe series.
Double Dragon Dojo
 
Final Fight Double Impact
The official site for Final Fight Double Impact.
ScrollBoss
 
Street Fighter plot canon guide
 
Streets of Rage Online
 
T.C.R.F.
The Cutting Room Floor wiki has a look at unused content in various games, and there are a few Final Fight games covered there.