For an eyeball-bustin' good time, visit Cover Browser. Pages and pages and pages of cover scans from comics, horror/fantasy magazines, manga, graphic novels etc.—no erudite text to clog up your senses.
I'm especially fond of their Creepy magazine cover archives. Some of my favorite Marvel Comics artists, like Gene Colan, Frank Frazetta and Frank Brunner also worked for Warren Publishing, whose titles, like Famous Monsters of Filmland, Creepy, Eerie and Vampirella, pretty much shaped my consciousness through my pre-teen years, before the first Damned and Ramones albums took over. For higher-quality scans of the Warren books, albeit with a slightly clunkier, more Web-designery interface, also see Pixeltube's Warren Magazine Collection.