Sony DSX-S300BT

via iPodNN

The Sony DSX-S300BT features a tray to dock an iPod/iPhone and built-in Bluetooth for hands-free calling and wireless music streaming.

Pioneer AVIC-Z120BT

The Pioneer AVIC-Z120BT features a 7-inch WVGA touchscreen, 3D graphics accelerator, onscreen iPod/iPhone control, Bluetooth, SIRIUS XM, HD Radio ready, and Pandora support.

Sony MEX-BT5700U

The Sony MEX-BT5700U is a single DIN CD receiver with Bluetooth audio streaming and connectivity for USB based media devices like the iPod/iPhone.  It also features AM/FM, HD Radio, 52Wx4 and 3.5mm input.

Source: MacWorld

Parrot RKi8400

The Parrot RKi8400 is a car head unit featuring Bluetooth A2DP, SD card slot, iPod/iPhone connectivity, USB PMP support and standard line-in ports.

Source: SlashGear

Alpine NVE-M300

The Alpine NVE-M300 is an add-on for the iXA-W404 and the IVA-W505 to enable GPS navigation.

Source: Engadget

Belkin Micro Auto Charger

The Belkin Micro Auto Charger converts your car lighter into a USB port to allow you to charge your gadgets.

Source: Switched

Dension IceLink

So you have your iPod and it works great, except when it comes to listening in your car. Maybe you picked up an FM modulator and that works somewhat well, except in large cities where it is almost impossible to get a clear station. If your car still has a tape deck maybe you have a mini-jack to tape adapter, which actually works fairly decently especially for 20 or so dollars it costs. Unfortunately if with both of those methods a point comes when the iPod runs out of juice and you have to charge it. Also both of those methods require access to the iPod to control your music selection. The Dension iceLink solves all of these problems.