Can running help your knees?

I’ve been aware of this for some time, but the New York Times have summarised some of the data suggesting that running is good for your knees. Most people seem to think that the impact of running is bad for your joints, but as long as you look after yourself and your joints you’re less likely to develop joint problems if you run.
Article:
New York Times: Phys Ed: Can Running Actually Help Your Knees?