I found a very helpful source when researching my project that I wanted to share...
http://emedicine.medscape.com/
Its basic information but also somehow very comprehensive ("This site is designed primarily for use by qualified physicians and other medical professionals") and has external links. Its similar to WebMD but has WAY less garbage. It is more prognostic than diagnostic.
Good luck! And be sure to comment on my awesome post coming soon about my topic!