Evil! Dishonest! Downright Wrong! This is not just an issue with SEO firms, but this is the first reported case I have seen in the forums. The case was brought up by Elisabeth, a Super Moderator over at the Search Engine Watch Forums. She said that she found an other SEO firm taking credit for her firm's work. She will be contacting the SEO Firm to take down this false case study immediately.
Please be on the look out for these scams.
For more information on the details, visit the thread at Search Engine Watch.