Did you know that the Preview app in Mac OS X — that seemingly simple PDF viewer — can scan and add your printed signature to a document? A new addition to the Annotations bar makes it possible to take a photo of your signature using your Mac’s built-in iSight or FaceTime camera. Chris Rawson at TUAW describes how. follow link
Enter Dashboard, Expose, or Spaces Temporarily
Hold down F9, F10, F11, or F12 (or whatever you've set for the Expose and Spaces keyboard shortcuts) for a few seconds, and then release the key to enter and leave the appropriate mode without having to press the key again. This is particularly useful for Dashboard, in which you can check the contents of a widget and then return to your work with only a single key press.
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Capture Your Signature Using Preview