Found this on it:
Dashing through the snow in a one horse GPS

What’s better than an in-car GPS unit? If you guessed an almost-sentient communicative
network of GPS units, then you, my friend, have won a prize (offer not valid in 49 of 50 states). You’ve also hit upon the idea behind Dash Navigation’s
Dash Express. Think of it as GPS meets social networking, but without all the annoying friend requests and embarrassing encounters with high school classmates.
See, instead of just pulling GPS information down, the Dash Express also transmits anonymized data from your unit back to Dash’s servers, which it uses to build a traffic model of your surrounding area. The more people in your vicinity with a Dash unit, the better the modeling. That info can be used to show you alternate routes and let you know when traffic’s been stopped by an accident, construction, or a shambling mass of zombies. And, unlike most GPS units, the Dash Express actually gives you information about side streets, not just major highways. Also, because the Dash Express is connected to the Internet, you can also search for info on restaurants, gas stations, services, etc. by using the built-in Yahoo! Local capability. And the team (which features at least one former Apple employee) has also created a plugin for OS X that allows you to select any location in an email, or webpage, or instant message, and send it from your computer to your car.
Me, I worry that some day the network of Dash Expresses might become sentient and collaborate to convince us that all of our city’s streets are gridlocked with traffic, effectively trapping us in our homes unless we’re willing to brave the outside elements and
walk—so, er, trapped in our homes. The one major downside to the Dash Express is that in order to work at its most effective, you’ll need a critical mass of at least a few hundred in your area. So, in other words, be prepared to buy a lot of presents for your friends. The Express will ship in late February for $599, plus a $12 monthly service fee (cheaper if you prepay).