SF Kosmo Gang
Plenty of info on all of Treasure's games. Pics, credits, everything basically.

Ikaruga.co.uk
Ikaruga videos, competition and strategies. Everything Ikaruga, basically.

Gunstar Heroes Fansite
I don't know what to call this site, but I'm sure that name will do. If you're interested in Gunstar Heroes then be sure to check the site out. Lots of info on the game there.

SuperPlay!
Really, you must check this site out. Lots of great videos of great games.

Shmups.com
Shmups.com. You'll find what you expect. Everything about those great scrolling shooters that we all love. Well, some of us love. Some of you probably couldn't care less about them.