Forget mobile device convergence, that's old news. Every smartphone on the market now handles everything from camera and calendar duties to gaming, GPS navigation, web browsing and social media. Differentiation is looking like the name of the game moving forward - offering do-it-all devices that distinguish themselves through a particular focus. Take Sony's reportedly upcoming PSP phone, which takes an Android 3.0 platform and mates it with a dedicated PSP gaming experience. Or this, the Garmin-Asus nüvifone A50, a fully-featured Android smartphone that comes pre-packaged with a car kit and built-in Garmin map data so it can shine as an in-car GPS navigation system. I've spent several weeks using the A50 as my primary phone, and if you spend a lot of time on the road, this new nüvifone is built for you and does a very credible job.