I have a Griffin iTrip Universal + (FM Transmitter).
Plugs in to the cigarette lighter and has a USB port so you can power/charge your phone using one outlet.
Works great.
They sell for $50 at Best Buy for the latest version.
However, I got it for $30 by pulling up the Walmart site on my BB and showing them the Walmart price which you had to order. Realized when I got home that the one walmart offers is actually the 2007 model. lol
Either way though, I think they are the same but just look different.