How do I wipe the hard drive on my MacBook?

I just sold my circa 2008 MacBook and want to wipe the hard drive prior to handing it over to the new owner. It looks like I can do this using the disk utility. Is that correct?

Complete procedure for an Erase and Install of OSX Snow Leopard here Mac OS X v10.6 Snow Leopard: How to Erase and Install
I assume that you bought the OSX Lion 10.7 Upgrade at the Mac App Store.
If so, then you can't sell it with your MacBook, since the license is tied to your own AppleID and not to the MacBook.
Stefan

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    Message was edited by: EZ Jim

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