There is an old axiom that books and booze are recession proof, and, unfortunately, that old saw is being tested. Wall Street is in turmoil, the economy looks to be heading for a recession, and Alan Greenspan went so far as to call the current credit crisis a "once in a century" event. Recession proof or not, faced with such economic uncertainty, booksellers, like all smart businesspeople, are looking for ways to weather a downturn in business.