At the 'Main' menu go to 'Features' and select the 'Codes' option. Then enter the following codes (without the quotes) to enable the corresponding effect.

Unlock 2008 All Star Jerseys:
Enter the code 'haeitgyebs'

Unlock Bobcats Racing Uniforms:
Enter the code 'agtaccsinr'

Unlock Pacers' Secondary Road Uniforms:
Enter the code 'cpares'

Unlock St Patrick's Day Uniforms:
Enter the code 'uclerehanp'

Unlock Valentine's Day Uniforms:
Enter the code 'amcnreo'

Unlock Superstars Team:
Enter the code 'llmohffaae'

Unlock Visual Concepts Team:
Enter the code 'vcteam' (without the quotes) to unlock the Visual Concepts team.

Unlock NBA 2K8 Development Team:
Enter the code 'nba2k' (without the quotes) to unlock the NBA 2K8 development team.

At the 'Main' menu go to 'Features' and select the 'Codes' option and enter these passwords to enable the desired effect in the game.

Unlock 2KSports Team:
Enter the password 2ksports

Unlock ABA Ball:
Enter the password payrespect