JBL's SoundFly lineup is one of the rarer breeds of wireless speaker we've come across: it's much like an earlier AirPort Express made solely for audio, designed to be as unintrusive as possible while it kicks out the jams. Those who find that stealthy sound appealing will be glad to hear that the more advanced of the two SoundFly speakers, the SoundFly Air, is now shipping. The 20W box will play audio streamed from any AirPlay-capable device on the same WiFi network while it sits demurely on a wall outlet. JBL is counting on a few tricks to set itself apart from the rest of the similarly Apple-oriented pack, such as linking up to four of the speakers for whole-home audio and offering an iOS app to tailor the output to the room. About the only reservation is a $199 shipping price for something that isn't as portable or universal as a Jawbone Jambox, but that may be the price to pay for a speaker that can offer longer range and syncing while it very nearly blends into the furniture.