As the early 2008 successor to one of the iPod's most popular portable accessories, Griffin Technology's new iTrip ($50) continues the family's tradition of offering simple digital FM broadcasting so that you can hear your iPod's audio on any FM radio or car stereo. This iTrip comes in black or white versions, each with a USB cable for pass-through charging with certain Griffin car accessories, as well as up and down tuning buttons, two sets of body…