This is a fantastic. If you've got yourself a new fifth generation iPod Nano and you actually use it to listen to the radio, and you choose to listen to either Nova or Vega, you can now tag songs on the fly, with the ability to purchase them the next time you sync your iPod to iTunes.
The service works with Nova in Sydney, Melbourne, Brisbane, Adelaide and Perth, as well as Vega in Sydney and Melbourne.
OF course, there are question marks over how many times you'd want to tag Britney Spears or Lady Gaga (never!!!), but radio station playlists aside, this is a pretty great service, both for the radio stations involved and the music industry as well.