As the first iPod speaker system to include iTunes Tagging, an Apple-designed feature that records track information from a live HD Radio broadcast to let you easily purchase the song in iTunes, Polk Audio's i-Sonic ES2 ($499) features AM, FM, and HD radio tuning, four audio drivers for a 360-degree soundstage around the unit, and video outputs that work with all video-capable iPods. A single alarm clock radio is also integrated into the ES2, which…
