Prime Spot, by Foto Bocch at flickr New York City has a buoy helping it resist the receding economic tide: Tourists. In particular, foreign tourists who are relatively flush with currency that has strengthened against the American dollar. The city's marketing agency NYC & Company says tourism increased by one million visitors during the first quarter of 2008 versus the same period in 2007, and that 20% of those visitors arrived from abroad. And......