Ok, today I got 2 more flats while riding the OCNP trail this morning. Cactus must be in thorn bloom this weekend, because I've gone about 2 months without any punctures, then I get 3 in one weekend. I'm going to have to research a better solution to this. I use to have Mr. Tuffy liners in my commuter tires, but that didn't always work well. I've used Slime before, and anytime my tires got wet, the plug formed by the slime would dissolve and they would go flat. Maybe they make a lightweight steel-belted radial bike tire?