Heroes:

The Comic Archive - Information source for Golden & Silver Age comics
Golden Age Comic Cover Gallery - Superhero, horror, and crime covers
Silver Age Marvel Comics Cover Gallery - Great Marvel covers
The Comics Page - History of comic books
Timely-Atlas Cover Gallery - Rare horror and war covers

 

Monsters:

A History of Horror - Silent era to modern
The Asounding B Monster - "World's coolest cult movie chronicle"
Universal Steve - A fan's site dedicated to Universal Monsters
Classic Sci-Fi Movies - A chronological listing of great sci-fi movies
Monstrous - Cool site with all kinds of monsters

 

Miscellaneous Sites
(Mix of some favorites, any subject)

The Redneck Tech - Plain tech talk for the common folks
McNattech - Computer services in north Alabama