Lifehacker - Clean Up and Revive Your Bloated, Sluggish Mac - Mac OS X
http://lifehacker.com/5252183/clean-up-and-revive-your-bloated-sluggish-mac

A good list of Mac performance tips

I think you should do this.

Data Permanent Eraser

"With stories abounding of identity theft aided by information lifted from discarded storage devices, you want devices you no longer plan to use to have no usable information when they head out the door. Here's how to wipe them clean."

Leave No Trace: How to Completely Erase Your Hard Drives, SSDs and Thumb Drives - Data wiping

Comment faire un peu de ménage sur votre profil #Facebook - http://is.gd/bsazh

Spring clean your twitter account

Photo collection tools