I just received the DL0 Transpod FM transmitter as an early holidy present. I believe it is mainly for use with the Shuffle, but can be used with any iPod/MP3 player as far as I know. The Shuffle plugs in via USB, while others can plug in using a standard 2.5mm headphone jack.
The quality of the sound via the USB on the Shuffle is subpar. If you hook it up via the 2.5mm headphone jack, it is much better. Why is this?
Oh yeah, I am keeping the DL0, because it will work with the black 30gb iPod Video that I also got as an early holiday present.....via a 2.5mm to 2.5mm cable that I found at Best Buy. Sounds awesome in my car.