PBS
Pbs: Leakey Family Discovers Human Ancestors
The PBS site covers the Leakey family and their discoveries in Olduvai Gorge in Tanzania. This information was part of a PBS exploration of human evolution.
University of California
Ucmp: The Tyrant Lizards: The Tyrannosauridae
This site from the University of California provides basic information on T. rex with links to related material great for a quick introduction.
Other
The Dinosaur Museum
The Dinosaur Museum is located in Blanding, Utah. Use this site to learn all about the exhibits and dinosaur information.