DRUB - Invulnerbility
DREAD - Unlimited Ammo
DRAG - Unlimited Turbo DRUG - Screen wobbles
DRINK - Rocketfuel

Use these at the menu:

DROOL - Get a Quick $500,000
DRAW - Get $1,000
DROP - Drop 10 Points
DRIVE - Get 10 Points

Thanks to Revolution readers Spencer the Dieck, Mark Crotts and Chris!