Canadian RIM (BlackBerry manufacturer) is challenging Apple’s Ipad to a duel with its very own model, the PlayBook. It will be sold in the USA as of the beginning of next year and in the rest of the world starting in March 2011. It is smaller and lighter than its existing rival and has a 17.8 cm HD screen, against the Apple gadget’s 24.6cm. The PlayBook will initially only come with Wi-Fi and Bluetooth; gadget-lovers will have to wait a few extra months for the independent 3G and 4G models.