We have a magento 1.5.1 installed on our server. In that the default currency is set to USD, but somehow, the products are displayed with Australian dollars. I checked in the System > Configuration > Currency Setup and again set the default website and default store view currencies to USD. But, to no avail.'
EDIT : I noticed that it's picking the first in the allowed currencies list. I deselected the Australian Dollar and then it started picking British Pound Sterling.