Today I took a couple of height-of-summer tomatoes that I froze, ran them under hot water, slipped off and discarded the skins, microwaved for a couple minutes to thaw, chopped them up while still soft-but-structured, threw them in a pan with a chopped jalepeno and salt and cumin, brought to a simmer, turned off the heat, and ended up with a nice little chili-tomato salsa.
Fun tomato fact: if you freeze a tomato with the skin on, all you have to do is run it under hot water for a few seconds and you can just kind of squeeze the skin off of it.
And frozen tomatoes keep for a very long time -- basically you just lay them on a pan to freeze them initially so they don't stick together, and then put them in a container. I leave the skin on until I have to use them. It's a lot easier than canning, though it does take up more space per tomato.