Sample usability reports
This page has links to dozens of reports! To evaluate them, put yourself in the position of the client: does this tell you what you need to know? Too little? Too much? Not the right info? http://www.pdfgeni.com/book/usability-report-pdf.html
From Usability.gov — http://www.usability.gov/templates/index.html#Usability — their other templates are useful, too.
Test report templates for writing the usability test report.