Running shoes for bad knees

Hi, I’m an IT guy being very interested in website designing and social network. I built this site as I wanted to make it a place where I can share and we can discuss together about running shoes. Why running shoes? I’m not an athlete or a marathon runner, I am just a casual runner being self-trained. However, shoe is my another favorite and running is my only hobby to get fit as well as relax after hours working with computer.