Screenshot

Freeware
Greenshot
-fast and easy
-full functionally and editing!

Webware
-Web based photo editing
-Be sure to install the firefox addon to get full functionality and screen capture 

Other options
Windows Keyboard Shortcut
Control+Print Screent 
adds a screenshot to your clipboard (you can paste into a power point slide and edit)

Windows Vista Pre-installed Program
C:\Windows\System32\SnippingTool.exe

MS Onenote 
Windows button + S (can crop to size)

Firefox Addon
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