Very nice!

If the base price, base currency, and the other currencies to use are parameters in the snippet call it will make a really great addition to MODx that can be used anywhere in the world. Of course rthrash will chime in here and ask for a tpl and placeholders so let me do it for him.
Having played with Revolution, I have to mention here that the Revolution Package Builder (when it’s finished) will make this a dream to package and install and will simplify the docs immensely. I can’t remember if the Package Builder will package up a non-MODx table so, with that in mind, you might want to test for the existence of the table and create it if it’s not there (that would make life a lot easier for the Evolution people too).