Nippon(Shootemup)Games for PC
A great site for finding a good majority of the games reviewed on this site.
Shooting Maniacs
Another great site for finding some hot user-made shmups. This one however is almost entirely in Japanese but is still reasonably easy to navigate.
Shmups Mk2
Because you can't possibly make a 2D shooter related website without giving reference to Felix, Akira, and the rest of the gang.
Shoot The Core!
Okay not much is there but expect to see another excellent 2D-shooter related site
