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.
Other
Onco Link: Brain Tumors
This site provides much information on brain tumors. Includes anatomy of central nervous system, types of brain cancer, and symptoms of brain cancer.