Pantech's Matrix PRO slides two ways onto AT&T

This thing's been on quite a journey from concept to production, but here we are -- finally, a true successor to Pantech's quirky Duo on AT&T. The Matrix PRO features HSDPA (up from UMTS), integrated GPS with AT&T Navigator, Bluetooth, a 2 megapixel cam, Video Share support, and Windows Mobile 6.1 Standard, but the real draw lies in the device's pair of sliders -- one for QWERTY, one for digits. At nearly 23mm thick, it's not the thinnest smartphone in the world -- that honor supposedly belongs to the Nokia E55 -- but where else are you going to get this many buttons on a single device? Pricing and availability are forthcoming.