AusTexMurf

Current tires on commuter bikes:

0 flats Continental Travel Contacts 700x37 in 1100 +/- miles

1 flat Schwalbe Big Apples 26x2.15 in 500 +/- miles piece of glass picked up on wet street.....lots of contact patch for glass to stick to when wet.......then rolls on it repeatedly.

0 flats Specialized Burrough CX 700x32 700 +/- miles

I would probably say that older models of the Continental Contact Security and Safety versions (their old tires, made in Germany, when it was called Contact and nothing else, i.e., no Travel, Tour, Comfort, etc. were the most puncture free tires I have used. The old Continental Contact Security tires could roll on my pedicab up to a year w/ no flats, operating in the streets and alleys in the bar district with ridiculous loads.
I had a Continental Contact Safety that rolled on a commuter mtn bike for over 6,000 miles with only one flat, to the best of my memory.

I have also enjoyed excellent flat protection and a smooth ride from about 6 Panaracer TServ and UrbanMax tires (pretty similar) in 700x32 size. 6 tires and probably at least 12,000 miles. Around 5 or 6 flats. Impressive protection from a fast, supple city tire.