About.com - Shoulder Pain 
Information on common problems and their treatment.
http://orthopedics.about.com/cs/shouldersurgery/a/shoulderpain.htmShoulder Physician 
Patient education for conservative and surgical treatment of shoulder and elbow disorders. Written by doctors.
http://www.shoulderphysician.net
Shoulder Pain Solutions 
Information on common shoulder problems and their treatment options. Also includes animations. Associated with DePuy Mitek/Johnson and Johnson.
http://www.shoulderpainsolutions.com
AAOS - Shoulder Topics 
Overview of shoulder problems and surgical treatment options from the American Academy of Orthopaedic Surgeons web site.
http://orthoinfo.aaos.org/category.cfm?topcategory=Shoulder
Shoulder India 
Dr. A.K.Venkatachalam provides information on common shoulder problems, treatment options and his orthopedic practice, located in Chennai, India.
http://www.shoulderindia.com
Shoulder Pain Questions and Answers 
Outlines common problems, treatment options, shoulder anatomy and diagnosis.
http://www.niams.nih.gov/Health_Info/Shoulder_Problems/default.asp