Best way to clean out Mac

I am getting a new MacBook Pro this week and I wanted to give my old one to my son. Once I transfer all of my data to the new computer, I would like to clean everything but the programs out of the old Mac before I give it to him. The old one has been a bit buggy of late. What is the best way to do this so that he can start over with a clean slate?

Hi DKK,
John gives some great advice, however you'll lose the installed programs. There's a good chance, though that you'll resolve the sluggishness. You can always reinstall the programs afterwards.
If you do go the route of an Archive & Install (assuming you're reinstall Leopard and not Snow Leopard) while you won't lose the installed programs there's a good chance that they may not work properly and you'll need to reinstall them anyways.

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