I've also had very good luck with my Targus Universal Auto/Air Adapter , which has several tips to fit many different types of laptops.
One road warrior fact of life is that you'll need to know where you're going, and you will occasionally get lost. Maps can help, but Global Positioning System devices can really simplify your life. The Global Navigation Satellite System uses a group of 24 satellites that enables a GPS receiver to determine its location, speed and direction. Now, personal GPS devices are as ubiquitous as they are feature-filled and reasonably priced. If your automobile or SUV doesn't have a built-in GPS, don't fret, you can get one with all the bells and whistles for a relatively few bucks. The DeLorme Earthmate GPS with Street Atlas ($70-$160) can interface with your laptop to help put you right where you want to be. The Earthmate uses a blend of U.S. Geological Survey topographic maps, updated street maps and aerial imagery to let you navigate in real time on 2-D and 3-D maps. The Earthmate also profiles steep climbs in advance to help you avoid certain treacherous roads. TomTom has some of the most popular satellite navigation products, and although they are bit more expensive ($400-$500), they have some remarkable features. For example, the TomTom GO 910 speaks 36 languages in more than 50 different voices and can even announce street and place names. It has a 20 gigabyte built-in MP3 player and doubles as a hands-free car phone kit using Bluetooth technology. TomTom also has motorcycle and PDA navigation units, in addition to the car units.