Maps, Distances, Directions
For most currencies type "exchange rates" in the Google search box and select currencies from drop-down menus.
Currency Tools (OANDA): currency converter, exchange reates, rates comparison table, and more.
Currency Encyclopedia (currency rates, forex news, and facts for every currency).
For most basic measures type your question in the Google search box, for example: "100 fahrenheit in celsius."
Measurement Converter: conversions various units and measurements, from common to ancient and specialized.
OnlineConversion.com: "convert just about anything to anything else."