What do travel writers, who essentially cover a luxury industry, do when the economy takes a nosedive? Penny-pinch, of course. The theme du jour is tourism on a dime, as budget-traveler Rick Steves and Rick Seaney of FareCompare.com offer money-saving advice on Talk of the Nation today. Similarly, New Yorkers (and tourists) have some resources to work with, as The New York Times went budget grocery shopping last week, about a month after New York magazine printed their wallet-saving guide. Still, these recommendations pale in comparison to travel writer and voluntary vagabond Rolf Potts, who advocates drifting as the ultimate relaxing (and cheap) vacation.