Building an AJAX currency converter with PHP, jQuery and Google

As you may already know, Google has a calculator feature built in their search engine, which can be used to convert measures, currencies, get stock quotes, weather data and many other features. You can see this features explained here.

Why wouldn’t we use it for something useful and build a simple AJAX currency converter using Google currency converter feature? We need some time, jQuery, Google, great music and of course, this tutorial.