The listing, iTrip Universal FM Transmitter and Charger has ended.
Here it is, iTrip transmitter and charger compatible with any audio source that uses a 3.5-mm headphone jack, including iPod, Sansa, Zune, portable CD players. Whoot!
I love this transmitter! When I first got it, I was disappointed that it seemed like you could not transmit in the best frequency of 87.9, but then I figured it out:
To change it to international mode (with the frequency 87.9 and so forth) all you have to do is hold the preset button for about 15 seconds, and the US will start flashing. Then you just hit the plus or minus to change to international mode, and voila! You now have the much coveted 87.9 frequency!