Alright folks. There are a few things to be answered which no one is mentioning. Firstly, most docks on the market were released prior to the release of the iPhone 5 or iPod Touch 5. As a result, they have mainly the 30-pin dock connection. In order to be able to "dock" or "cradle" an iPhone 5 or iPod Touch 5, you need to have the Lightening connection. Some companies such as JBL have recently released or are planning to release this sort of connection while most others have decided to move on to using Bluetooth or Airplay connections, simply for the wider compatibility and the growing trend to move to wireless technologies.
In order for you to be able to use an existing 30-pin speaker dock with your new iPhone 5 or iPod Touch 5, you need to convert the 30-pin connection to Lightning so everything plugs in together. To do this you need to purchase one of two adapters. Apple sells both. First is a simple short adapter. The other is a long corded adapter.
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Now your device cannot just sit in the dock or cradle. It needs to be physically supported so that there is no strain on the connection. 30-pin docks commonly have grooves in which the device sit in and rest so it doesn't bend the connector or the inner connection of the device. If you use the short adapter, then your device will be propped up on a pedestal and have zero support, possibly damaging your device. That's assuming your device can even balance as most docks come out on an angle. The best bet is to use the long corded adapter. Plug that in, and let your device sit on the top or table around the speakers. You get the full plug-in and charging capability.
So take that into consideration before looking at any docks. In my opinion, I find the newer Bluetooth speakers to be quite nice since they will forever work with all your devices (Macbook, iPad, iPhone, iPod, and other Bluetooth devices). If you are willing to wait, companies are planning to release Bluetooth 4.0 speakers that will provide better quality and drain less battery. I have a Logitech Bluetooth Boombox and it works great. Being wireless is awesome.
But to each there own!