FlyingG,
The stadium is a about 20 minutes of so from the airport and ringmaruf's suggestion of the airport bus sounds good. I went to a night game so I did not look into this option. My experience with driving in Pittsburgh was horrible. Everything is under construction with closed bridges, detours and the such everywhere. This was my first time in Pittsburgh and I had no idea what it was like. It's very scenic with all of the bridges and hills but traffic is very bad because of these bridges and tunnels. However, PNC Park was a great experience. One of the best of the new breed of baseball stadiums.