Originally Posted by John E
Sheldon has a great article on tire pressure. I weigh around 150lbs and normally run about 90-95 PSI front and 100-105 rear, which is pretty close to your practice. I have run higher pressures in the past, but I now prefer a bit more traction and a bit less skittishness over the bumps.
I weigh 165 and regularly run 95 rear/90 front in my 25's. Haven't pinch flatted in 2 years. The better grip and less road buzz make a noticable difference on the often poor road surfaces I ride.