Microsoft tonight showed off the first production device running Windows Phone 7. Revealed during a taping of the Engadget Show, the early prototype is an LG-made QWERTY slider that bears a strong resemblance to the eXpo. Not much is known about the device itself besides its 5-megapixel camera, but it will have to meet Microsoft’s chassis guidelines, which includes the three-button interface, a fast processor and an 800×480 or larger touchscreen….
