I've started using Panaracer Pasela and Pasela TG tires on my commuter bike. It's the first tire I've ever recommend other people try. They are reasonably priced, cheap compared to some of the other flat resistant tires, and wear very nicely. My most recent tire, a 700x26c Pasela TG, lasted more than 3,800 miles on the rear. Before these tires, I used Continental Gator Skins and Specialized Armadillos, neither of these tires made it much past the 2,000 mile mark.