MedlinePlus Medical Encyclopedia: Hammer Toe 
Describes this condition, symptoms, causes, risk factors, tests, treatment, and complications.
http://www.nlm.nih.gov/medlineplus/ency/article/001235.htmHammer Toe
Provides a photograph with details about this foot problem. From ePodiatry.
http://epodiatry.com/hammer-toe.htm
Hammer Toe Deformity and its Surgical Correction
Discusses aetiology, pathomechanics, conservative management, considerations, and procedures.
http://podiatry.curtin.edu.au/encyclopedia/hammertoe/
eMedicine - Hammertoe Deformity
Presents an introduction, indications, relevant anatomy, treatment, complications, and prognosis. Includes photographs.
http://www.emedicine.com/orthoped/topic457.htm
MedicineNet - What is Hammer Toe
Doctors review of this deformity of the foot.
http://www.medicinenet.com/script/main/art.asp?articlekey=54807
