Australian shops will need something similar to this as well: prices shown in the shop and on checkout should have GST included and on checkout the amount of tax included will be listed along with the total cost. Such as:
TOTAL includes GST $1.00
From what Yoav said above the easiest way is to disable tax altogether and create a module to extract tax but this feels a little too much like a hack to me, rather than a proper solution. Surely the better way would be to create a module that prints the total amount including the tax? Or is this going to be far more difficult to achieve?
Hopefully something like this could be included into the core in a future release as it looks like a few countries have tax set ups like this.