What happens when you strip the Dock Connector iPod-specific parts off of an iTrip and add a rechargeable battery? You get iTrip Universal ($40), a tiny, affordable digital FM transmitter that preserves the same general features from Griffin Technology's more expensive iTrips while becoming compatible with more devices. Only slightly larger than a second-generation iPod shuffle, iTrip Universal has a backlit tuning screen, the ability to switch into…
