It would be great to find a way to capture remedies people have tried and success they've had. It may be difficult to design such a survey though. Maybe you could list common remedies discussed in the forum (niacin, garlic, anti depressants, etc.), ask people if they've tried it (yes/no) and if "YES" provide a spectrum for how successful it was.
Another survey idea is compiling the results of all medical tests people have undergone. It would be great to get all those numbers in one place and be able to compare them. Again, might be tough to design such a survey, but I like the idea. Heck, you could probably even look through NSF to find results people have posted.