Griffin Technology today announced the iTrip FM Transmitter for iPod has begun shipping. Officially announced at Macworld Expo this past January, the iTrip rests atop the iPod and attaches securely to the headphone jack and can broadcast to any available frequency on the FM dial. According to Griffin, the $35 device requires no batteries — it draws minimum power directly from the iPod and automatically shuts off after 60 seconds without music. For charging, the iTrip rotates 90 degrees, exposing the FireWire port. Customers who pre-ordereded the iTrip will be among the first to receive the units.