Yeah we're on the same page.

The converter would need to recognize both the base units (m,ft,kg) and how its mathmatical relation to the complex units (like the ones you've shown above). I'd like to base the system on the <a href="http://aurora.rg.iupui.edu/~schadow/units/UCUM/ucum.html">Unified Code for Units of Measure.</a>.

I haven't looked a the converters here because you need to buy a commercial license. Whats with that? And over at the codeproject the unit converter's zip file was corrupted.

Let me know if you have any references for this project.