Even though I have standalone GPS devices, I also run a TomTom app on my Windows Mobile smartphone. It's always handy to have a GPS in your pocket if you're traveling. I use Google Maps to view traffic data and I've played around with a Garmin GPS app and I also tried iGuidance. Since you can get GPS navigation apps for other types of smartphones like the Apple iPhone and the BlackBerry Storm, the days of the standalone GPS devices are numbered.
The Garmin Garminfone is coming to T-Mobile and it's going to be the first Android™-powered smartphone and Garmin GPS navigation device in one.
* Voice-guided and on-screen directions with automatic reroutingGiven that the Android 2.0 and 2.1 operating system already includes turn-by-turn GPS navigation, why would you want to get a Garminfone? It's for people who want to have the Garmin interface. I don't have a strong preference for any particular interface, so I'll use whatever I can if I need a GPS.
* Real-time traffic, weather, ETA, and gas prices
* Thousands of downloadable apps from Android Market
* Access to personal and work e-mail, IM, and text messaging