[nielsbot]

We're a web company. We should own a critical technology for getting on the web. Better experience surfing means more traffic for Google. But also, if we own the browser, we can push Google services and make them better and more convenient. We can also influence web standards to our favor. And a nice side-effect is we can better track users.

So--one part we're an ad company and one part MS-style "embrace and extend" the web.