I'm sure that macaroni and cheese soup was invented accidentally, by someone whose cheese sauce turned out too runny. Soup is basically a thin sauce, anyway. The version I had was tasty in a very kid-friendly way, but I'm betting there are quite a few amazing mac n cheese recipes out there that could be converted into soups, or beer cheese soups that could benefit from a little macaroni.
Sorry for the persistently petite posts. I'm suffering a little post-grad depression and slacking on things that I should be doing in favor of sleeping late and watching lots of 30 Rock (I just discovered it a few weeks ago and I am now officially in love).