armadillo
the specialized armadillo line of tires are the best tires a person can buy if the don't want to play around with patches.
the first set of armadillo tires i bought were for my commuter. I went with 25c, but they make a 23c. I have almost 2000 miles on these tires and i have yet to get a flat. believe me, if i were on any other tire i would have had many, many flats by now.
you are going to pay a bit for a set, $100-$120, but you will never, ever have to worry about a flat.
i recently put a pair of these on my racing/century rig.
i couldn't tell you were my patch kit is, not really worried about it anymore.