You're at a coffee shop or restaurant and it's time to pay for your sustenance. After reaching for your wallet, you're presented with an Android tablet? This particular scenario is taking place more and more often as small businesses are taking their point-of-sale systems mobile, and Leaf is one of the big contenders battling for market share in this industry. Its signature product, known as the LeafPresenter, is an Android-based tablet with a funky lip on the top ri
