Here's a nifty little one-click converter for temperatures in Celsius and Fahrenheit.  I find it very useful when I write to friends who live in areas of the world which use Celsius temperatures.  And, the temperature converts for either measurement.

When I write about the weather I can convert my weather degree temperature from Fahrenheit to Celcius.  That way others can get a real feel for what's happening from my end.  This temperature converter has provided me many times with conversions.