I've been fairly diligent in stretching my legs. I admit, that I thought my knee was going to hurt yesterday. I ran well until the 5 km point, at which I could start to feel the ITB tightening. It was never painful, but it would have been if my run had gone any further. I also ran on the opposite side of the road. I've read that continously running on the same side of a cambered road will cause problems for your legs.
So I'll keep stretching and switching sides. Hopefully I'll be able to get back up to where my mileage was in a few more weeks. Injuries stink.