A portable device is used to capture, in real time, data sufficient to identify an item, such as a product or service promoted, or a music track played, on a broadcast medium such as radio or television. The capture device can be a standalone implementation, or an application program executable on a personal communication device such as a cell phone or Blackberry. The capture device communicates the captured data to a remote server via a selected wired or wireless channel, or the internet, and the server provides services to support the user in responding to the radio or television broadcast item that corresponds to the captured data. The server on demand downloads to the user additional digital content associated with the identified radio broadcast item.