When we talk acquisitions in the mobile space here at Gamezebo, we're usually wowed by a number like $104 million (what GREE paid for OpenFeint) or $400 million (the price paid for ngmoco last fall). But how about $12.5 billion? That's how much Google is paying to buy Motorola Mobility - and despite being 63% above stock price, I say it's going to be worth every penny. Here's why.