Really free—no trick. It (Google) does it the way any modern digital company should: by handing out a lot of things to make money on a few.<br /><br />Source: <a href="http://www.amazon.com/gp/product/1401322905?ie=UTF8&tag=a0b8a8-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1401322905">Free: The Future of a Radical Price </a><br /><br /><iframe src="http://rcm.amazon.com/e/cm?t=a0b8a8-20&o=1&p=8&l=as1&asins=1401322905&fc1=000000&IS2=1&lt1=_blank&m=amazon&lc1=0000FF&bc1=000000&bg1=FFFFFF&f=ifr" style="width: 120px; height: 240px;" marginwidth="0" marginheight="0" frameborder="0" scrolling="no"></iframe>