Marvel.com offers news, interviews, previews, videos, games, discussion and more for all things Marvel, including Iron Man, Spider-Man, Hulk, X-Men and all your favorite superheroes, from comics to video games to movies and beyond.
DCComics.com: Welcome to the Official Site for DC Comics. DC Comics is home to the "World's Greatest Super Heroes,” including SUPERMAN, BATMAN, WONDER WOMAN, GREEN LANTERN, THE FLASH, AQUAMAN and more.
CDisplay may rule the roost as far as comics viewing & library apps go, but this is a great site for a criminally underrated piece of software; ComicRack. By far the best app for comics, and this site is also capable of allowing users to share their libraries over the net. A must for all comics collectors.