This Fall, Belkin will be shipping it's next generation FM transmitter for iPods. It'll be the smallest the California maker released so far and includes the "ClearScan" feature that tells what is the best and clearest FM station to turn to, to listen to your iPod content. The TuneBase plugs into the cigarette lighter and the iPod through the integrated cradle. It also has a line out to connect to your radio if it has a line in and includes a high contrast display. TubeBase will be priced at around $90. The TuneCast Auto has similar feature set than the TuneBase but with a different form factor: it includes a 3.5 ft long cable to the iPod, instead of the cradle, so you can control it while driving... not sure that's legal though... even in California ;-)
TuneCast Auto will be sold at $80.