U.S. National Library of Medicine.  A good overall description of Basal Carcinoma.

The Skin Cancer Foundation. Different types of skin cancer including Basal Carcinoma.

Definition of basal cell carcinoma from cancer.gov

Basal cell carcinoma - Overview from University of Maryland Medical Center

Mayo Clinic. Pictures to help identify skin cancer.

Harvard University. Tanning beds cause skin cancer.

OncoLink. Abramson Cancer Center of the University of Pennsylvania.

Skin Cancer blog from about.com

The Skin Cancer Resources Directory

Macmillan Cancer Support  (UK)

Nature.com Cancer Resources Directory

Cancer Research UK

dmoz open directory, Skin Cancer Section