Both forums have their merits Janos, but I reckon this forum has more of em than that
other forum. The layout of iceinspace is much more user friendly than AO. But there will always be something new to discuss in both forums with varying opinions and very interesting viewpoints. Also, this forum has an active moderator, namely Mike, whereas they are pretty much silent or non-existent on AO. And lastly, iceinspace has better smilies
This forum has been more active because a lot of us used to be active on the AO forums
There are no other major Australian forums that I'm aware of however I did stumble across a link to the ASNSW discussion site but didn't get a chance to look at it so I don't know if it's just for their members.