wipe

Secure Empty Trash

Secure Empty Trash really gets rid of files in the Trash can.

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Destroy Confidential Data

If you want to be quite sure no-one can retrieve the information from an old floppy or other data store destroy it: physically.

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Take Control ebooks (affiliate link) are superb.
I do some of my best learning from them. Buy through my link so I can make more and better Tips.

Take Control of Using Lion.  Buy Take Control of iCloud.  Macworld iPhone 4S Superguide  Take Control of iTunes 10: The FAQ, Second Edition