About to sell my macbook, how to wipe hard drive clean

I'm about to sell my macbook (I've upgraded) , how would I wipe the hard drive, the whole computer for that matter, clean of all websites I've visited, passwords etc?
Anything else you can suggest? Like clear all bookmarks,and in Safari pull down menu, I guess 'reset safari' and 'empty cache' too, etc?
And in Accounts under System preferences can I change the name? I see I can change the password, sorry I'm not too computer proficient...I hate to miss something.
Thanks all

Here's what you need to do:
1. Re-install Mac OS (don't choose an option that keeps the old files, wipe it clean!)
2. After re-installing, open Disk Utility, and run the Erase Free Space utility on your newly formatted drive. This will ensure that your old files can't be recovered.
If you want your personal data off of your Macbook, simply doing step one will NOT be enough!!! Erasing and deleting are two different things. (Step one deletes, step 2 erases.)
Also, what chipperz posted should work.
Message was edited by: musicmannn

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