A wireless iPod would be funny. On the other hand, there's a WLAN ban here in the apartment (collectively agreed upon), so while it would be amusing on one hand, it would be pointless on the other.
If Apple would finally teach the iPod Bluetooth, that would be something else - especially for syncing, Bluetooth would be quite practical. Sure, Firewire is faster - but for the initial synchronization or after extensive shopping sprees in the iTMS, you can just plug in the cable. Regular playlist updates and rating updates could easily be handled via Bluetooth.
Anyway. A Bluetooth iPod will probably never exist, just like I'll probably be waiting forever for a Bluetooth digital camera.
At Industrial Technology & Witchcraft you can find the original article.