The iPad mini has arrived — and so has our review. Just last week, Apple introduced the world to the newest member of its wildly successful tablet line, an adorable, diminutive slate with a 7.9-inch display. It even had an adorable ad to show along with it: an iPad mini joining in with a full-sized iPad to play "Heart and Soul" on the piano. But to think of the iPad mini as a companion to the 3rd