Call me crazy but I ride 32mm tires with 60-80psi. I weigh about 155lbs. I have never had a pinch flat and it's pretty comfortable. I noticed on Sheldon Brown's site that was linked earlier that I'm right in his range of size/pressure so I feel like I did a good job! Of people I know who ride, I have really low tire pressure. It seems like there's a huge window.

Chuckie