In a 20 year mtb history, I've only just started suffering with knee probs--but this is mostly likely due to excessive commuter mileage and my style of pushing the big gears.
I'm really missing things (haven't ridden properly for a few months now) and am trying different things, although rest and time away from the repetitive movement probably will do me many favours.
Now doing short, light spins with easy gears, shorter cranks and flat pedals (after years and years of SPDs). I've noticed that my feet on the flats move around quite a bit and tend to be most comfortable out on the far edge at a slight angle (with toes out, heels in).
Just noticed these online:
http://www.sjscycles.co.uk/product.asp?pf_id=14725&rt=0&rid=1500973&src=00063&
and wondering if anyone has tried or got any advice/comments??
Cheers,
Rob

