There’s a lot of things you can Search in Google and most of them require a specific command. For example: site: will allow a user to search within a given domain. Google has a page that lists most but there a whole lot more (Fedex and UPS packages for example).
The most popular commands are included in the Google Toolbar. But the other day, I was working on somebody else’s computer without the toolbar installed. I was helping out with some SEO stuff so I needed a lot of the Google commands. It was like working on a UNIX machine. Back to the command line! We’re coming full circle, maybe Longhorn will be command line based.