RIM today formally launched the long-in-development BlackBerry Curve 8520, its first more consciously low-end QWERTY smartphone. The device trims costs compared to the 8900 by using a lower-resolution 320x240 screen and a 2-megapixel camera but also marks a number of firsts in control for BlackBerries: it abandons the trackball for an optical trackpad which is ostensibly both smoother to use but
