I've spent a large amount of my time over the last few years trying to understand Google.
If you run a website, or part of your business is done on the web, Google is your best friend. For most of my websites my Google traffic is more than double that of ALL other search engines combined.
Google is king, and position on Google can make or break your website. For my razor website (http://straight-razors-for-sale.com) my taffic more than doubled in moving from the second spot on Google to the first spot for my target search term.