How to prepare HDD for safe sale?

Jul 21, 2003
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Coruscant, Galactic Republic
Your Mac's Specs
14" iBook G3 900/640/40 _ _ Power Macintosh G3 All-In-One 315/768/20 _ _ 20 GB iPod
Since I just got a new job, I'm considering upgrading to a different Mac (most likely 15" PowerBook). I'd like to sell on eBay, but I'm concerned about any information that might be left on my hard drive after a clean install. What would be the best way to prepare my computer for a sale to a stranger? Is a program like SuperScrubber really necessary (I'd prefer not to have to buy a program just for this task), or are there ways to do it within OS X? Thanks in advance.

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