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If you're looking for a relatively cheap way to add Bluetooth wireless audio streaming to a powered speaker or audio component with an audio input, the Logitech Wireless Speaker Adapter is a good solution.

RIM's BlackBerry Music Gateway makes it dead simple to enjoy smartphone audio in the living room.

For cars with an auxiliary input but no native Bluetooth, the GoGroove SmartMini Aux is an effective means of adding both hands-free call capability and audio streaming from a smartphone.