Resources

Zan's Super Home
Marvel Super Heroes On-Line
MSH Expert Edition
Earth Alpha - IMHO, the best MSH campaign website that I have seen.
Arakne's Web
Technohol 13 : The Atomic Drink - Home of the Psi Manual.
Marvel Super Heroes RPG Homebase
Expanding the Universe
Marvel MSH RPG Message Board

Character Stats

Norseman Central - This site has a pretty impressive amount of character stats as well as the Marvel Super Hero database program.
The Marvel Universe
The Marvel Archive
Stark's Iron Waves
Ben Reilly's Marvel RPG Page
Marvel RPG and more
Tarrentz Marvel RPG Realmz
'Nuther World
Martyrs and Madmen
Shawn's Saga Page

Comic Book Pages

Flash: Those Who Ride The Lightning
GLA - The Great Lakes Avengers
The Villians of Marvel Comics
Marvel Atlas Project
Unofficial DC Universe Who's Who
The Unofficial Golden Age Website

Worship the comic. No, this one has nothing to do with super-heroes, however it is a great daily internet comic strip.