Good blog link about giving even the "worst" customers our best service possible. Written about freelancers, but I think it could apply to any industry:
http://freelancefolder.com/why-your-worst-clients-should-still-get-your-best-service/?utm_source=Tweetie&utm_medium=twitter
Have you been giving all of your customers your best service, regardless of their response or attitude?
Anne Marie