New version: Supports creation of null units, useful when specifying base conversions (decimal, binary, octal & hex) and conversions from/to roman numerals. Solved a tiny interaction with autosave on Blogger.

This script will add a button to the Edit Html editor tab on Blogger's Edit Post pages to insert unit microformats, as described in Greasemonkey and Microformats. It enhances Blogger's user interface with a dialog to easily mark up a measurement unit with its scalar value, its name and a suggested target unit.

Also available is a Test Conversion link, which leverages Google Calculator to see if the microformat-enhanced measurement unit will work with a companion script, UnitFormat. Please have a look at Greasemonkey and Microformats (or just look around Brucknerite, my blog) for more documentation.