Internet voting in federal, state and local elections?

Recently, I received an e-mail alerting me this year’s elections to the American Mathematical Society Committee and reminding me that I can vote by postal ballot or over the internet. I vote in these elections each year and voted over the internet in their elections in 2006 for the first time. 

I suspect that many organisations allow their members to vote over the internet in their internal elections and I wonder whether voting over the internet will become an option in Australian federal, state and local elections and referenda in the near future?