To find a hot spot where soaring oil and commodity prices, and the booming economies of the developing world, are keeping cash registers ringing and construction crews fully employed, you don't have to trek to Dubai or Moscow. You need travel only as far as Houston. In May, the unemployment rate in the nation's sixth largest metropolitan area was a measly 3.8 percent. In the past year, Houston-based companies, which include 26 Fortune 500 firms, added 71,000 jobs to their payrolls. The local United Way closed out its fiscal year with a record $76.1 million in donations. At the Galleria, a high-end shopping oasis, Bridgette Bottone, manager of the De Beers store, notes, "We're still selling the big guys": three-carat-plus diamonds that retail for more than $50,000. Pessimists are as rare as Birkenstock sandals, or OBAMA '08 stickers in ExxonMobil's parking garage.