My wife, Amanda, sent me this link a couple of days ago.  http://pulptastic.com/17-awesome-things-didnt-know-google/ While a couple of these are pretty inane, most are very cool, and I can tell you from personal experience that this is by no means a comprehensive list. You can also do things like look up definitions, graph equations, play six degrees of Kevin Bacon, check things like sunrise/sunset times, or the status of a flight, perform measurement and monetary conversions, or even flip a virtual coin. Many of these things can be useful for making lessons and your life easier, and some of them are just fun.