You can use the following PowerPoint-style media kit template to create one for your own website. This sample media kit is geared toward publisher websites that are attempting to sell display ads via a direct ad sales program. It contains slides for: Site Overview, Site Content, Audience/Traffic, Demographics, Advertising Opportunities, and a cursory Spec Sheet/Rate Card slide (plus the title slide, of course!).
If you’re creating a media kit, you may also find these resources to be useful: