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Nokia recently announced their AD-42W Audio Gateway, which lets compatible devices like phones or computers stream music out in one of two modes, to either home stereo systems or Bluetooth headsets. It works with phones with the A2DP Bluetooth profile; currently only the Nokia 8800 supports that but more are coming this year, maybe even the highly-anticipated N80? Price is still TBA, but the AD-42W Audio Gateway is expected out in Q2 2006.

Nokia Wireless AD-42W Audio Gateway [Nokia]
Nokia announce Audio Gateway [AllAboutSymbian]