Sherman offers instructions into how much you can do with Google. Way beyond its signature searching ability. Perhaps the most obvious and successful is its news feeds. An excellent way to read from newspapers all over the world.
Also, in its regular searching, Google stores old versions of many pages it spiders. Sometimes you may find this useful, when a website deletes some of its content before you got to it.
Plus, there are the thousands of newsgroups. Ironically, some of these predate Google and the Web itself. They hark back to when the Internet communication was a much simpler text-based mode.
For programmer types, Sherman explains the Google API. Which lets you write code that programmatically hooks up to Google, without the drawbacks of screen scraping.
With several of the Google options that Sherman describes, it is unclear what profit Google ultimately makes out of them, beyond just mindshare. But I guess its search profits are so lucrative that it can afford to bleed on these other options.