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Monetizing remnant advertising is not an easy task, but <a href="http://www.5to1.com/">5to1
<img src="http://tctechcrunch.files.wordpress.com/2009/09/5to1-logo-215x110.jpg" width="215" height="110" />Remainder aka <a href="http://en.wikipedia.org/wiki/Remnant_advertising">remnant advertising