If you're looking for an attractive, no-frills FM transmitter for your iPod Nano, we recommend the $50 iBlast FM from Radian Technologies. The Nano-only device plugs into your car's lighter jack and rises 6 inches on a thin, flexible steel neck. It's incredibly lightweight and portable, though a lighter adapter is necessary. The transmitter also recharges your Nano when powered.
The iBlast FM (available in white or black) has 200 radio frequency options that you can surf through using the tactile up and down buttons and includes five programmable presets. We'd prefer a line-in port for listening to non-iPod audio sources, and while the LED looks nice at night, it's difficult to read in daylight. But sound quality trumps all when you're talking FM transmitters, and the iBlast FM doesn't disappoint. San Francisco city listening (88.1) was nice, bright, and mostly static-free.