LIfehacker: Geek to Live: The command line comeback. A nice summary of Firefox+Google as a command line interface to a bunch of useful things.

Firefox 2 users may have noticed that the Google search bar tries to suggest terms as you type based on other popular searches and relevance. Gina points out that Google's calculator feature is available in this bar: Type any arithmetic expression, such as 100+20/12, and—without having to hit Enter—the answer will appear underneath the box.