What's the best way to completely wipe my Mac?

I'm selling my 17" iMac G5 as I've just replaced it with a shiny new 24" Intel iMac [droool!]. Anyway, I want to know what software or what's the best way to wipe/clear my Mac and start from scratch so the person buying it doesn't have all my rubbish on there - plus can't retrieve any of my private files.
What have you guys done in the past in situations like this? I know you can do a clean install off the original installations CD's but will this be enough to get ride of all preferene files and folders etc etc?

Hi
The easiest way is to put a new installation of your OS onto the Mac.
Insert your Install disk 1 into to the drive and then Restart, and hold down the C key to take you to the installation windows.
Select your language, the start up Volume and choose Erase and Install.
At the point your registration process starts, abandon the registration, quit and eject the disk and switch of the computer.
This will allow the new user a freshly installed system, whereby they can complete the registration process themselves. Make sure you hand on the disks.
If you want to be extra thorough, you can, booted from your Install disk use Disk Utility to Zero All Data, before doing the Erase and Install described above, and if you want to be paranoid thorough, you can choose to overwrite the disk with several passes before doing the installation described first. Note this latter process can take from several hours to several days depending on the selection and the size of your internal hard drive.
regards roam

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