FlickIt!
FlickIt! is the simple yet extremely useful web service for dynamically generating thumbnails of anything.
Generate a Thumbnail
Size of Image (pixles)

Thing to Depict
Web Service Documentation
To use this web service in your application simply embed an Image tag in your HTML, like so:
<img src="http://flickit.brinkster.net/flick.aspx?size=[Enter Size Here]&query=[Enter Query Here]" />
     
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