I have written the most complete guide to Shwedagon Pagoda on Today in Myanmar. The guide starts with the history of Shwedagon pagoda (including the opinion of the archaeologists on the origin of Shwedagon), structures around Shwedagon, Shwedagon stairways, platforms and structures on the Shwedagon. There is also a detailed floor plan/map of the structures on the Shwedagon terrace as well as the detailed description of the Nine Wonders of Shwedagon. I believe this guide is so far the most complete guide of Shwedagon Pagoda available on the Internet. All the articles in the Shwedagon Pagoda Guide can be found at Shwedagon Pagoda Guide | Today in Myanmar.