I'm after an FM transmitter with internal memory, or an SD card, since I don't really fancy taking my iPod everywhere with me (it practically lives at work where I'd be lost without it!)
Ideally, I'd like something that either:
1. Is absolutely tiny and plugs into the car charger, so it's hidden away.
2. Is like one of those small cheap/crap MP3 players, but with transmitter capabilities. So I can plug it in and update it and it charges at the same time.