fosk.it! 2.0

A quick way of changing the default file format for Grab.app (or “Command + Shift + 4″ short-cut) from .tiff to other formats such as .pdf, .png, or .psd etc…
Choose any of the following line and paste it in your Terminal window and press the return key, that’s it.

defaults write com.apple.screencapture type png
defaults write com.apple.screencapture type pdf
defaults write com.apple.screencapture type jpg
defaults write com.apple.screencapture type tif
defaults write com.apple.screencapture type psd

By the way, here is a list of short-cuts for making a screenshot quickly:

Screen to file:

Command + Shift + 3

Screen to clipboard:

Command + Control + Shift + 3

Crosshair screen selection to file:

Command + Shift + 4

Crosshair sceen selection to clipboard:

Command + Control + Shift + 4

Window to file:

Hit spacebar after invoking “Command + Shift + 4″, then click the appropriate window

Window to clipboard:

Hit spacebar after invoking ‘Command + Control + Shift + 4? then click the appropriate window