In Mexico there is an interesting little innovation called Tetra Pak. In the grocery store there are cartons of milk sitting on the shelves, warm. Evidently, they don't get old because they have been sanitized using the Tetra Pak process (which is owned by a company, also called Tetra Pak, which invented the first paper milk carton and is based out of Sweden). This process involves heating the milk to higher temperatures than pasteurization, but for only a few seconds--much shorter than pasteurization. It is then instantaneously cooled to avoid killing all the nutrition. By killing all the bacteria at the high temperature, there is nothing to make the milk get old while sitting on the shelf.
They offer a couple of different flavors of this, in addition to the regular plain milk. I've seen chocolate, strawberry, and cookies and cream. The strawberry is pretty good; I haven't tried the others yet.
I don't know if this hasn't made it to the US yet or maybe I just never saw it there, but I think it's an interesting little thing.