About Us
Tagline - A few words or a brief sentence summarizing what you do.
Summary - 1-2 paragraphs that offer a bit more detail about your goals and main accomplishments.
Fact sheet - A section following the summary that elaborates on its key points and other essential facts about your company.
Good and Bad examples can be found here: http://www.useit.com/alertbox/about-us-pages.html