We all yearn for a life lived sans wires, yet many of us still find our media players dangling from the things. Mono Bluetooth headsets are already everywhere, but this could be the year that those of the stereo variety take off, and Altec Lansing's hoping its new BackBeat series will be a contender. They're made in partnership with earpiece-guru Plantronics, so callers will find integrated voice dialing, omnidirectional microphones, 7 hours of talk time, and AudioIQ to boost volume when you're in a noisy situation. For the music listener the sets include tune-channeling, canal-sealing bud