The Onion, America’s satirical newspaper known for pushing the comedy envelope and treading the knife edge of good taste, is expanding. The paper, which is based in Manhattan these days after years in Wisconsin, recently introduced a local edition for the Minneapolis/St. Paul market, (it already publishes local editions fro Chicago, Madison, Boulder, Denver, and New York) and plans other offshoots in large cities around the country. The Onion currently has print circulation of around 320,000 and its web site gets a whopping 3.6 million unique visitors every month.