The Polk I-Sonic ES2 is the second-generation version of the famed do-it-all radio. It handles HD Radio, XM, Sirius, your neighbor's brainwaves, AM, FM, net radio, Rhapsody, our brainwaves, and iPod. Use full capabilities at your own risk. And it now has a tag button (center, bottom) that applies tagging data to up to 50 songs at a time for storage in its own flash memory and the iPod. You could tag songs heard on HD Radio for later purchase on iTunes. Coming in October for $499.