yeah, i had it a few years ago. really tight, irritated itb and some muscle imbalances causing patello-femoral syndrome (basically, one of my muscle groups was pulling my kneecap in a way that it shouldn't causing a lot of knee pain). it was brought on by doing too much at the same time - i was training for the oxfam trailwalker, riding my bike 200km a week and playing soccer.
same sort of deal, ice, anti-inflammatories, reduced workload, foam roller and stretches. sucked. nowadays they're both pretty good. when i get on the bench at the physio it's always my glutes and piriformis' that are in bad condition. they still work the ITB, but it never hurts like it used to.