From: ted.dunning@gmail.com   
      
   Entity extraction is viable for some applications.   
      
   You have to be willing to accept a significant error rate.  This is a   
   show stopper for some situations, but a non-issue in others.   
      
   You also have to be willing to put a fair bit of work into tuning and   
   re-tuning your application.  Named entity extractors are currently very   
   domain specific and need a fair bit of hand-holding.  For low to   
   moderate volume situations, it can even be cheaper to do the task by   
   hand.  Only for high-volume and (error tolerant or high-value)   
   applications is named entity extraction a very plausible option.   
      
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