American Academy of Family Practitioners "Obesity: Assessment and Management in Primary Care" – follows NIH recommendations. This is also "Report 6 - Obesity as a Major Public Health Problem" from the AMA.
American Society of Bariatric Surgeons (ASBS) and Society for American Gastrointestinal Endoscopic Surgeons (SAGES) joint "Guidelines for Laparoscopic and Conventional Treatment of Morbid Obesity"
Association for Morbid Obesity. Patient Advocacy site. Can find out information on surgeons and insurance coverage in specific cities. List of surgeons.