Microsoft's Windows 8 Consumer Preview was made available to download yesterday, giving everyone a chance to experience the company's most revolutionary change in user interface since Windows 95. The interaction paradigm has shifted from a mouse-centric desktop to a touch-friendly, highly visual Metro style UI. The old Start orb has been retired and replaced by a Charms bar, which is brought to life with an inward swipe from the right. A swipe from the top down dismisses the app you're in and returns you to the home screen, and the left and bottom edges also have actions associated with them. Gestures play a very significant role in Windows 8, but they're only one aspect of a truly gargantuan list of changes.