i found this floating around, hope it helps, let me know please
Start up from a Mac OS X Install CD (one whose version is closest the the version of Mac OS X installed). You should first disable Open Firmware password protection, if it is enabled. Hold the C key as the computer starts.
Choose Reset Password from the Installer menu (or Utilities menu in Mac OS X 10.4 Tiger). Tip: If you don't see this menu or menu choice, you're probably not started from the CD yet.
Select your Mac OS X hard disk volume.
Set the user name of your original administrator account. Important: Do not select "System Administrator (root)". This is actually a reference to the root user. Do not confuse it with a normal administrator account.
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Use F8 when booting to enter the boot options. Select safe mode Log on as administrator, and click "yes" to the prompt that appears. Go to the users control panel, from there you can reset your password.
First of all when you set up your password originally did you put in a password Hint? If so, if you type an incorrect password 3 times trying to log in it will show you your hint. I recommend trying this. You might find you have a hint which will help you remember! If not:
You can reset your administrator password by inserting your MAC OS X Install Disc 1. Then Restart your computor and hold down the C key as it starts up. 2) Choose Utilities>Reset Password from the menu bar and follow the onscreen instructions there. I know of no other ways to get back your password. If this is helpful, please vote or comment! Good luck!