Well I tried Edge's list, and it didn't match up with the ones hitting mine.
Roger, I contacted Compuware as well, and they escalated it, but came back and said no, it wasn't them. They say that they identify themselves in their User Agent.
Someone from Google popped in the Google Analytics help forum in Google Groups and said they were looking into it. They have more resources than we do. But don't hold your breath for anything happening right away.
Right now I've it not serving AdSense or analytics codes to anyone who comes in on IE with no referrer, and hoping for the best. All I can do.