Williem Odendaal posted some helpful Google tips a while ago.  I thought I’d share them with you.

1. After the search phrase, type site:microsoft.com. This will return only results from the microsoft.com domain.
2. To find out what a word means, type define insane. With define being the keyword and insane the word I'm unsure of.
3. To do conversions, type 12 pounds in kilograms. Very nice. Obviously this works for a lot of other conversions as well.
4. And I just read about this this morning - to search for a word and all it's synonyms, use the tilde key. For example - ~food ~facts.

— Matt Ranlett