As pulled from the Google Australia weblog on the fires in Australia goes into detail and has a live map of the fires, included below.
There's more maps of fire in Australia at aus-emaps; this is a link to static copies of maps, which is better than the live image because of heavy server load.
The University of Maryland / NASA MODIS view of Australian fires has satellite coverage as well as historical coverage so that you can get details on past days fire and previous years.
The best single source I could find for maps of Australia is aus-emaps. They say about themselves:
update: a fire map of Australia showing the fire seasons, from the global fire monitoring center at Uni Freiburg.