This website lists lots of cool search options provided by google. Perform calculations, currency conversions, find out the phone number of someone, get movie reviews, weather reports and lots more. The author of the website explains each function with a description and example.

Here are some examples that I’ve tried using.

altantuya location:malaysia
(Find Malaysian news articles on Altantuya.)

65 kg in pounds
(Conversion of my weight from kilograms into pounds.)

define:imagination
(defintions of the word imagination from the web)