I bought new shoes at the same time I started running on the road, they turned out to be fairly bad ones, compoundng the injury. I stopped using them but alas too late. I think the idea of weights to strengthen my thigh muscles is a good one, or perhaps i could cycle. I've had RSI a couple of times in the past but not in the knees, it was in my arm from an awkward job and then my wrist from typing, the current injury in my knee feels pretty much the same. If i stop i'm fine the next day, but i don't want to stop running, it is too much fun.
I think also my gait for long distances isn't developed, as a youngster i prefered the short distances and sprinting. So at the gym i was doing a really fast 5Km but then outdoors i was doing a more plodding run, which i think caused additonal jarring on the knee.
I've read the linked post, thanks, what does ITB stand for?