At the Main Menu, go to Inside EA Sports. Move your mouse over the credits tab, but don't click, and keep it there until it begins to wobble. Now enter any of the following "Codes":

Code - Effect

sbatsman - Super Powered Batsmen
bigbat - Bat Becomes Big
ulockall - Unlock Everything
bouncyball - Ball Bonuces a Lot
fatfielders - All Fielders Look Like the Umpire