The AirPlay Audio System by Acoustic Research is better than traditional docking and other wireless devices because you can control your music from your Apple iOS device, giving you freedom as a full-function User Interface (UI) remote.

ENGADGET: Acoustic Research unleashes pair of audio docks in AirPlay and Bluetooth flavors

Once you set up iCloud using your Apple ID, any content that you buy from the iTunes Store will show up on other devices without any syncing.

WSJ: iTunes You Can Use

Some of these are networkable, which means you can connect them to your home network and access the photos via Wi-Fi from multiple PCs, Macs and other devices.

WSJ: Using the Cloud to Store and Transfer Files

To stream music or other audio from your smartphone or tablet to your favorite speakers, the new Wireless Speaker Adapter for Bluetooth audio devices uses Bluetooth wireless connectivity.

ENGADGET: Logitech intros $30 Wireless Speaker Adapter for WiDi-enabled laptops