http://www.unc.edu/~rowlett/units/
In addition to its extensive coverage of common units of measurement, notable also for its inclusion of more esoteric measurements, such as hat sizes, stimp rating for golf greens, and shotgun gauges.
http://www.ex.ac.uk/trol/dictunit/index.htm
"This dictionary provides an account of the principal units of measurement to be found in use around the world today, and the conversion factors often needed to change them into 'standard' units of the SI system."
http://www.megaconverter.com/Mega2/index.html
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