iPhone/iPod docks are two-a-penny these days, but iPad docks? Even more than a year after the tablet's launch, they're still a relative rarity. JBL's latest speaker dock, the JBL OnBeat, could well be your one-stop-shop dock when it comes to blaring out music from an iOS device, thanks to a dock that supports iPhones, iPods and larger iPad slates. But is it any good? Read on to find out.