This blog post from the developers of the FreshBooks online business accounting system demonstrates audience focus in multiple ways, starting with the effort behind the message. Every business worries about how quickly customers will pay their bills, so FreshBooks analyzed the customer data it had on hand to see which payment terms and invoice messages generated the quickest responses. This alone is remarkable customer service; the audience-focused presentation of the information makes it that much better.
We have annotated a copy of the post that you can share with your students (on two PowerPoint slides).
(The PowerPoint slides were updated on 10-09-10 to correct two of the annotations.)