I made a large batch of (vegetarian) split pea soup and froze the leftovers. Reheated last night with a bit of water to thin it out. The frozen/reheated soup was actually better than the fresh soup- it had a sort of natural sweetness to it.
Any other _simple_ soup recipes that are really good frozen and reheated? So far I've frozen and reheated vegetable soup, split pea soup, and ground beef chili.