Just when it seemed as if Bowers & Wilkins' Zeppelin Air had the premium AirPlay speaker market all to itself, Danish audio company Libratone delivered Live ($700) to our offices for testing -- an updated version of its unusual prior-generation Beat. Shaped like a rounded-off triangular tower with a chrome handle on its back edge, Live is wrapped in contrast-stitched black, white, beige, or gray wool and topped with glossy plastic. Rather than shipping…