If you prefer a doctor's care to home remedies, you'll find support for that preference at Southern California Orthopedic Institute. They consider physical therapy to have no value, but they do recommend several preventative measure for the patient to undertake at home. Their main recommendation is use of braces and, if conservative measures fail, surgery.
Interestingly, The American Academy of Orthopaedic Surgeons favors conservative, non-surgical treatment.
Coping with Tennis Elbow offers a detailed exercise program to prevent recurrence once symptoms have disappeared. Note, though, that it gives exactly the wrong advice about racquet weight.
In A Simple Exercise Relieves Tennis Elbow Pain, About's Sports Medicine Guide reports a recent study that finds twisting a flexible rubber bar extremely effective as therapy.
Physical Therapy Corner: Tennis Elbow provides good illustrations of recommended exercises.
Do you know of any great tennis elbow sites I've left out? If so, please post them in this forum discussion. Countless elbows out there will thank you.