It looks like Australia is the place to be if you want to maximize your wealth, developing.
Staff.com put out the following infographic looking at average annual salaries for web developers, software developers, graphic designers, and some other positions.
Australia is pretty much ahead in all categories except graphic design, where it's beaten only by Switzerland. For some reason Switzerland isn't shown in each category though. Either way, it looks like Australia is not a bad place to have a developer or design career.