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The iTunes wifi music store has officially launched. You can now access the wifi music store from your iPhone or the new iPod Touch in order to purchase songs and albums directly to your device.
You can currently only download music with the wifi store, but television shows and movies may become available later on. The wifi access is only available for hotspots working with the 802.11 protocol. This may limit you somewhat, as the devices only have wifi antennas. You'll also need to reset your settings before downloading any songs, if you've used a hack to unlock your iPhone.