I've found foam rolling can be a great symptom reducer with OS. The muscles get tight and shortened, through various activities, thus the tendon attachment gets strained because of the increased tension, then the bone grows to try to bridge the gap and ease the pressure. Decreasing aggravating activities does help and is the traditional approach. Foam rolling is awesome because it can loosen up those tight quads and let you get on with it.

Hmm...good resources. Fitter First has a handout somewhere. And Youtube has oodles of vids of foam rolling routines. You can also play with the angle of the quads, turning slightly to the left and right focussing on one quad more than the other.

The foam roller is a great tool even if you had no OS and were simply an athletic person needing a method to loosen up the muscles, reducing those muscle knots that build up.