One of the many responsibilities teacher-librarians have recently assumed is the development of their school library's web site. Such site provide an organic "window" to the library's programs, services and resources that can be accessed by students, teachers, administrators, parents and community members. As such, they represent another vital library resource. Teacher-librarians have a range of tools to help them assess the print resources they choose to include in their library collections. However, there are few such instruments to help them evaluate electronic resources. Furthermore, educators often lack the time and/or the expertise to evaluate the resources they, themselves, create. This article describes an annual web site evaluation project, assigned to students in a graduate-level course, that focuses on the evaluation of educator-created web sites. It demonstrates the importance of web site evaluation by describing a web evaluation activity that benefited all involved. The graduate students had an authentic experience of evaluating a web site for a real client, using a variety of evaluation instruments. The teacher-librarian had an opportunity to receive objective feedback about her school's web site and a number of ideas for improving that site while, at the same time, becoming aware of the criteria for creating effective web sites and the importance of web site evaluation.