You never know if you'll have Internet access (or how good it will be) when you're traveling. The Sprint Overdrive 3G/4G is the premier mobile Wi-Fi hotspot that will allow you to use the cellular network for mobile Internet no matter where you travel. It even works in the car.
If you're a true tech geek then you probably carry a bunch of devices and chargers. You may run out of power without access to an outlet at some point. That's where a device like the Callpod Fueltank comes in. It can give your devices a charge when you don't have access to an outlet.
Pictured here is the Garmin Nuvi 3750, which is amazingly thin and very robust and easy to operate. While some are opting to use their cellphone GPS for directions, a hard core road tripper will probably want a dedicated unit. Garmin also has less expensive models than the sleek 3750 (which costs $349).
You can also read books on the Apple iPad, although it's not as good in full sunlight as the Kindle. However, if you're under an umbrella or inside then the iPad can do a lot more than just read books. With it you can watch movies, surf the Web, flip through photos, write journal entries, and a lot more.
Myvu is a futuristic pair of glasses with a view screen on the lenses. It connects to an iPod/iPhone or Zune (or other compatible devices) and then allows you to watch video content from those sources on your glasses.
If you're heading somewhere that doesn't have air conditioning then you may need to bring your own fan, and there is none better than the new Dyson Air Multiplier, which is also especially safe with kids because it has no fan blades.