Selling Mac, can hard drive be securely erased?

I know that Leopard allows 35-pass erase as it's maximum security level for formatting hard drives - but can this be trusted when selling a computer? I've heard people saying that the only secure way of removing data from a hard drive is to smash it with a hammer.
I'm planning to sell my PowerMac G5, and have a couple of low capacity SATA hard drives that I was planning to include with it.
My data isn't 'top secret' but it's possible that caches might contain my credit card details or other similar data. How safe is the 35-pass erase?

Hi bilbo_baggins-
Unless you are selling it to some government spooks you should be fine
If you are that concerned, go buy a cheap, low-capacity SATA drive and install that to be sold with the machine.
Luck-
-DaddyPaycheck

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Selling Mac, can hard drive be securely erased?

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