There is an interesting article at a site called “LifeTracker” that lists a variety of options and tricks when performing Google searches. For example, did you know that you could convert currency or measurements? Find out the time in another zone? Track a flight?
There is also some good advice, like limiting a search to pictures of faces when you are looking for a person, or using the cache to view an otherwise blocked site. Rather than go through all the tips here, I’ll just point you to the article at: