I've been thinking about buying one on Amazon now for 2 hours! lol It'd be nice to not have to mess with any wires...
Please let us know how it sounds. I am debating whether or not to get one myself so that I can use the BT streaming. I know the cord sounds better, but don't want to have to wait till September. I'm just wondering if you can navigate playlists and stuff if you have the navigation unit.
I'd wait I'd wait or buy a refurb at store.apple.com instead (be careful to get the gen that you want). See Mac Buyer's Guide: Know When to Buy Your Mac, iPod or iPhone and the pattern of Touch updates at iPod - Wikipedia, the free encyclopedia. You can verify whether the dates are right via Apple - Press Info - Press Release Library.
I have an Itouch gen2. I really like it. But I dont have a prius to try it out on yet. I have tried in on a regular AUX connector in other cars and it is fine.
I get my 3Gs tomorrow supposedly... alas my Gen 2 doesn't have an iPod port so All I can do is the bluetooth connection...