Extreme Units Converter (Version 2.1) is an application which gives you the ability to perform the conversion between the most common units: it includes five types of measurements (Weight, Height, Area, Volume and Temperature).
It is part of the ToolsBox Software collection of Yazin Aziz and is available from http://www.download.com/ToolsBox/3260-20_4-6276192.html
I don't think a Home Site is available although (supposedly) the author is contactable.