I currently commute about 400 miles per month. I've had 4 flats in the past size months, two were pinch flats and two were little wires. One pinch flat was low pressure, the other a large rock. I run 26x1.25" performance Metro tires and Pricepoint 5-pack tubes. I don't like the 1.25" Pricepoint tubes, they inflate unevenly and take a few days to smooth out.
On my recreational road bike, I have one tube that has over 8k miles on it, been through several tires and both front-and-back. All the flats have been on the other one. I get a flat every 1000 miles or so, depending on where I'm riding.