WebMD
Web Md: Adult Brain Tumors
This site from WebMD Health provides great information on adult brain tumors. Describes what they are, gives information on treatment, and then provides a link to many of the different kinds of adult brain tumors.
Macmillan Cancer Support
Macmillan Cancer Support: Understanding Brain Tumors
The causes, diagnosis, and treatment of brain cancer is examined in this comprehensive site. The site then moves from the general to the specific by delving into the different types of brain tumors.