FastStone Capture - Very good Free Capture Tool
 

http://www.faststone.org/FSCaptureDetail.htm

This freeware is very handy: even cursor and screentips are captured! Besides that, it includes its own editor for post processing!

Take a look on this example below and observes the screen tip ("Open" on Irfanview):
http://www.digitalfaq.com/archives/error.gif

The handy toobar:
http://www.digitalfaq.com/archives/i.../2006/08/2.png