Slow and steady growth for podcasting

The Pew Internet & American Life Project has released a report on podcast use in the US. It shows that 19% of people have downloaded a podcast at least once, up from 12% two years ago. But only 3% say they do it every day, although that’s three times more than did two years ago. Would be interesting to compare that to those who listen to radio, the closest comparator. Would be even more interesting if we could dig up some Australian statistics on podcast use. Does anyone know where to find something like that?