While there's an array of unofficial third-party keyboards willing to pair up with your 7-inch RIM slate, an approved peripheral is likely to be the better option. At least, it's what the BlackBerry-authorized add-on aims to accomplish. Dubbed Mini Keyboard, which also doubles as a "convertible" case, it's said to start shipping on March 23rd for $120, packing a multitouch trackpad and claiming up to a month of juice on a single charge. Additionally,
