Internet radio purveyors from Spotify to Rdio keep upping the ante with more playlist features and design overhauls, and the competition for your ears' attention is only getting fiercer. One of the newest players is Thefuture.fm (formerly known as Dubset), which launched last month with a focus on DJ-curated mixtapes. Today the service outed its iPhone app, which includes a "smart search" feature for finding mixes by song or artist an
