A Dictionary of Units Summary of units and measurements in use around the world today.
Footrule Includes converters, units and measures, data tables and calculators.
Measuring Units Conversion Tables Conversion from/to metric and imperial.
megaConverter Weights, measures and units conversion/calculation modules.
OANDA: The Currency Site Currency converter and currency exchange.
Temperature Conversion Calculator Temperature conversion in numerous units.
Time Zone Converter
Universal Currency Converter Perform currency conversion.

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Google: Online Calculators
Yahoo!: Measurements & Units
Librarians Index to the Internet: Calculators
DMOZ: Online Calculators