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<a href="http://Groupon.com" target="_blank">Groupon.com</a> is about to go public.&nbsp; But does it work?&nbsp; Tech Crunch has an interesting video that profiles three companies who have used the service.  It's interesting to watch the customers talk about their experience.  The cupcake guy had to learn how to maximize the coupon.  And in the restaurants case, they actually lost money.

Is this good business?