Kevin Tofel points to TabletPCReview, who have the low down on a great travel accessory from Belkin.
On the run in your car with mobile devices all the live-long day? Belkin's Travel Power Adapter might be the best friend your glovebox every had based on this overview at TabletPCReview. For around $100, you get the adapter that fits in your vehicle's cigarette lighter and 11 interchangeable tips. Simply plug in your notebook or other device while you're driving and you'll be charging up your laptop on the go. 
What a great accessory for the mobile geek. I could of used this for a few long road trips in the past!