American Academy of Dermatology - Information for professionals covers academy meetings, education awards programs, membership, dermatology as a specialty, employment, foundations, advocacy groups, databases and socioeconomic issues. The site also provides an online guide for patients.
American Society for Dermatological Surgery -  This site has information on continuing education (it's still under construction) and some great pictures to see.
American Society of Dermatology - It has some great links, medical news stories, but it may have too much commercial stuff. 
Continuing Medical Education in Dermatology - This site has links that can help you with your education towards dermatology.
Internet Dermatology Society - Great site with lots of information about dermatology issues!
Matrix Dermatology Resources - Courtesy of the University of California at Davis, this resource holds texts and tutorials created for second year dermatology medical students, archives of an online discussion group, an online dermatology journal and more.
Society for Pediatric Dermatology: Useful Dermatology and Medical Sites - It has some great links to this topic.

Brown University School of Medicine Department of Dermatology -
Cukurova University Dermatology Department - See pictures of cutaneous leishmaniasis online. Also, learn about dermatologic surgery, skin allergies and Cukurova University's academic programs in dermatology.
Duke University Medical Center Division of Dermatology - Great links and information of the dermatology department there.
Department of Dermatology: University of Iowa - Along with a list of dermatology societies and organizations, this site holds dermatology databases, tutorials, dictionaries, images, academic program information and other resources...
Harvard Skin Disease Research Center - includes department information, patient information, patient support groups, residency program, societies & organizations involved with dermatology, academic departments, dermatology databases, dermatology resources, some medical resources, and some links to explore...
University of Virginia Department of Dermatology - Check out this site's dermatology knowledge builder, or read about the university's dermatology program and faculty. The site provides an online application...
Virtual Dermatology - case studies from Indiana University