Tomorrow night (May 14), Global Teleclasses is offering a free class about Secret of Injury & Pain-Free Intelligent Performance: Joint Mobility from Scott Sonnen. I'd done some stuff from his books and liked it enough to consider the class worth trying.
I have some personal experience with joint issues, but not much as such things go. I get some flack from my knees, probably as a result of medium-sized injuries. Glucosamine has helped (I couldn't tell a difference between chondroitin and sulfate). The Five Tibetan Rites, a sort of cross between yoga and calesthenics, have done them a lot of good. I needed <a href="http://www.amazon.com/10-Minute-Rejuvenation-Plan-Revolutionary-Exercise/dp/0307347176>The 10-Minute Rejuvenation Plan: T5T: The Revolutionary Exercise Program That Restores Your Body and Mind</a> to learn them properly. After I'd been doing them a while, I noticed that the muscles around my knees felt stronger, and going down stairs became generally not a problem. Recently, I'd been getting pain from a joint in my left index finger. I've never injured it and I don't overuse it. I've found that moderate amounts of gentle movement (using my right hand to move the joint a bunch of times) has cleared up the problem. I'm not saying that all arthritis can be cured with alternative methods, but there's a lot of cheap safe stuff that can be worth a try.