Griffin rarely builds iTrip FM transmitters without their own integrated screens for FM radio station tuning, but the new iTrip DualConnect ($60) takes a semi-new direction for the company: it's a universal "play, charge, and control iPhone or iPod touch through any car stereo" design that can be used as either an FM transmitter or an auxiliary audio out device as needed in a given car. This combination of features is useful for frequent car-renting…
