If the advent of reservation scalpers like PrimeTime Tables and Weekend Epicure didn’t prove that good reservations are more in demand than ever, an article in this weekend’s Wall Street Journal pretty much makes an open-and-shut case. They used OpenTable, a free online reservation service, to try to get spots at the top 40 restaurants in the world, and often struck out; after 3,000 tries — calling every half-hour for six weeks straight — they still couldn’t score a 7 p.m. table at Del Posto. They do report some small triumphs: A San Francisco software engineer figured out how to get a reservation at the French Laundry by reloading an OpenTable page at exactly 11:59:55 a month in advance. And in fact, the free service is probably your best bet, despite the many strikeouts. Still, we prefer to simply call the same afternoon.