The following address is for sending snail-mail to Marvel; although slower than emails, tweets, Formspring posts, etc., snail mail can still be extremely effective.

Marvel Entertainment, Inc.
135 West 50th Street, 7th Floor
New York, NY 10020

Dan Buckley: Publisher
Joe Quesada: Chief Creative Officer
Axel Alonso: Editor-in-Chief
Tom Brevoort: Senior V.P. of Publishing
Michael Pasciullo: VP of Merchandising
Simon Philips: President, Worldwide Consumer Products, and CEO, Marvel Animation
Todd Jefferson, Director of Games
Eric Rollman: President of Marvel Animation
Jeph Loeb: Executive VP, Head of Television for Marvel Entertainment