Mike's starter idea gave me some auto-related ideas:

FM modulator/dock for iPod in car
Car detailing kit from Zainostore.com or Griottsgarage.com (I prefer Zaino, but both are high quality)
Jawbone bluetooth headset (At last, one with DSP noise cancelling!) Don't forget, come Jan 1, holding your cell to your ear finally becomes illegal in California...and it's about freakin' time!
Portable Nav system from Garmin or TomTom