James, a few years back I wrote an iPhone app that lists Texas tracks. They are broken down in to three categories: drag strips, ovals, and road courses, so it doesn't include karts as you are looking for. I try to update the data at least once a year, but as Nick and rebel mention above it is ever changing and hard to keep up to date and accurate. It is a free app if you want to check it out, just search for "Texas Race Tracks" on the App Store.