Supanova is far from the only anime convention in Australia that's to say that is not really a convention in the first place. Or even all that anime related. I wouldn't go if you paid me. Anywho, here's where the real action is...
Anime.au April 3 (you just missd it)
AVCon 2004 July 16-18
Manifest August 14-15
Animania October ?
PANIC December ?
A little info on each convention.
Anime.au - This was their first year and quite frankly I haven't heard anything as to how well they went, with the exception of their flop of an AMV comp... better luck next time.
AVCon - Without doubt has the best AMV competition. And an Awesome Quiz Night. I'm not bragging or anything. Drop by and see my panel.
Manifest - This is just plain awesome. If ou only go to one con this year, make it Manifest. Not sure what it is about Manifest, but it sure is a hell of a lot of fun. Definitely best for Cosplay and Karaoke.
Animania - I'm going to be an ass about this and say it outright. They're corporate whores. Boasting figures that are near impossible for a con that has had very little success in the past. the only way I can see them doing this is if they ciombined with Supanova... not that they don't get enough of those kind of fans attending as it is.
PANIC - Seeing as they have no real history to fall back on it's hard to say. This is Deaths_Ally's baby. Maybe he'll drop by and give you some info.