I've buy a new Air Book for may self :-) and I want to offer my Macbook pro to my sun. I really want to know what should I do to clean all my information in the my old computer?

I've buy a new Air Book for may self :-) and I want to offer my Macbook pro to my sun. I really want to know what should I do to clean all my information in the my old computer?

Backup your data off the machine to a external drive (not TimeMachine) and disconnect.
Create another Admin account in System Preferences and log into it, delete your Admin Account and reboot.
Optional: Open Disk Utility and Erase Free Space (Zero good enough, 7x for military level, both take time)
This should be good enough to remove just your account and data without the hassle of reinstalling the OS and all new programs again.
However if you need that level, then c boot off the 10.6 disk (or command r boot on Lion) and use Disk Utility there to Zero or 7x erase the OSX drive/partition, quit and reinstall OS X. Much more work that likely is unnecessary in your case.
Good Luck.

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