This is defintiely worth a look...A clever bloke by the name of Matt Haywood has created a site based on Google Maps which provides a visual way to navigate around Australian Wine Regions and zoom in to find the details of all listed wineries. This is a really nice way to get a perspective on the geography of the regions and where different vineyards are in relation to each other. You can even switch to satellite mode to see satellite images of the locations, although these are not yet available to a decent resolution for all locations outside major metro areas.

There's been lots of innovation done on top of the Google maps service, but this is my favorite so far.