The Engadget gang got their hands on pre-release Griffin iTrip Mini and wrote up a review:
Simply stated, the iTrip mini takes the sound from your iPod mini and broadcasts it so any FM radio and receive it. This is very handy for the car, in home stereo, boom boxes, wireless headphones and anything else that can play FM. We have a shower radio and use the iTrip to broadcast our tunes while in the show too. It’s pretty cool not have to plug in a bunch of wires, the iTrip mini doesn’t require batteries (it uses the iPod’s) and that’s why we really like it. That and unlike a lot of gadgets, this one looks great and works as described.