Madden NFL 2004 Cheats (PlayStation)

Get a gold on the different difficulty levels in
  all the mini camp challenges to unlock cards

Build up your EA Bio by playing other EA Sports
  games or completing specific challenges to unlock Madden Cards like
  these
  Level 2: #204 Bingo! Cheat
  
Level 4: #246 1990 Eagles Classic Team
  
Level 6: #186 Steve Spurrier Coach
  
Get Cheerleader/Pump up the
  crowd card
  
Go to mini camp and beat the game situation. 
  You will get a cheerleader card equal to the team you beat the
  challenge with

Use Football 101 and run through all the plays in your playbook to
  tack on alot of tokens which are used for madden cards