RayBradbury.com offers an opportunity to learn about one of Science Fiction's greatest writers. The site contains a biography, summaries of the author's works with links to purchase them, messages from Ray, a newsletter, interviews, photographs, and video clips.
RayBradbury.com gives fans (or students forced to do an assignment) the opportunity to interact with the author and other fans (or students forced to do an assignment) on message boards and e-mail correspondence (although this writer suspects Ray isn't actually the one responding to the e-mail).
The site's only weakness is the lack of ease of navigability. If you wish to include lesson plans that integrate technology into your Ray Bradbury lesson plans or Fahrenheit 451 activities, take a few minutes and check out the site, so you look really smart when your students ask you questions.