For some reason, our tomatos are still going. Unusual for us, but I'm not complaining, especially since the year started so late. I had to cover them once due to frost last week, but they're getting a little reprieve right now.
Our season usually ends really early, so what we do is grab the whole plant and hang it upside down from the rafters in the basement. The fruit will turn color on its own. For the ones that don't stay on the plant, spread newspaper on a shelf (or 5 - I always plant too many tomatos) and lay them on it. Check on them regularly.