Wow, wow, wow... talk about easy-peasy-Japanese. I could not have been more impressed. The functionality of the unit conversion calculator in-and-of-itself is nothing to write home about BUT, that which comes with employing jQuery + jQTouch most certainly is.
Wowsers. Yep. That's all I got. Wowsers.
The iPhone app includes four conversion calculators - a length converter, liquid converter, temperature converter, and time converter. From your iPhone, check out the converter here: iPhone Unit Conversion Calculator.
Don't forget to add it as a full screen app by hitting the + sign. :)