I found a couple of articles, not the best I must add, but it's something to get us underway.
An article written by Kimberly Green titled 'A Brief History of Olympic Medals' which can be found at the following link - http://ezinearticles.com/?A-Brief-History-of-Olympic-Medals&id=3793318
This short article looks at the design aspect of the Olympic Medals through history.
Another article with a small amount of text is from about.com by Jennifer Rosenberg titled 'Interesting Olympic Facts' which can be found at the link - http://history1900s.about.com/od/greateventsofthecentury/a/olympicfacts.htm
This article has many interesting Olympic games historical facts.