This looks like the perfect traveling companion for an iPod! It has a built-in FM Transmitter, charger, and cradle, in a single unit. And leaves the top of the iPod open for use with accessories like the remote control.
Time to start returning those Coke bottles for the deposit, to save up for the $79.99US fee. Good thing is, I've got until September to save up...
The iTrip is less-than-ideal for me, since it doesn't charge, and blocks the remote. RoadTrip looks pretty darned sweet (and uses the dock connection for audio, so it's higher quality line-level output)