Here are some great sites that have helped me with my autograph collecting! If you would like your page listed here, please e-mail me!
Autoworld - great page with lots of baseball
Pretzel Boy Central - lots of successes, great for Hall of Fame baseball players
The Autograph Arena - successes from the 4 major sports and more
Player's Network- contact any active player
Mark's Signing Bonus- great baseball autograph page
Pam's Autograph Superhaven
Chicago46's Autograph Headquarters- great page, lots for trade