Hey Matthew! There's a group of us from the Sunny Coast champing at the bit to go to that conference - all of us members of AN. I think there's about 9 of us planning to go at this stage. There will be more publicity as the planning progresses. I'll post updates on the Aussie Group page as they're available. There's a place marker for the convention at: http://atheistconvention.org.au/
but no content posted there as yet - but check it from time to time. I think the blurb is going up soon.
Keep in touch - if you go, we'll be sure to catch up for dinner or, at least a drink - or three. ;-)