this article on ITB Pain, its sources and solutions.
I remember having a difference of opinion with a few folk when I was doing my PT course about whether you could stretch the ITB or not. I'm glad to say I argued the case for not and this article agrees with me!
The article looks at friction and compression as the potential sources of ITB pain and favours compression arguing that it's simply not possible for friction to be the culprit. Sadly there's no discussion of adhesion as a possible factor and I wonder if that's because it's not considered to be significant. Anyway, it's worth a read.