http://oncolink.upenn.edu/
http://www.oncolink.org/

It brings information about risk, prevention, screening, symptoms, diagnosis, treatment, and support for all cancers and also ways for cancer patients and caregivers to cope with cancer, side effects, nutrition, general cancer support issues, end of life issues, and shared survivor's experiences. There's an ask the expert space divided into types of cancer, a library with cancer related material, an art gallery, a collection done by cancer patients, a guide to help people deal with a cancer diagnosis and resources for nurses. A lot of information in Spanish is available.