well i've been trying to in WA.
We were considering running a nationals. So far the biggest hurdle is not knowing any freestylers over east, and then finding out if they might be keen on travelling. Also finding a number of capable unbiased judges might be hard :)
we have had 3 freestyle video comps over here but only 1 video submitted.
Talking to a couple of ppl recently we were considering organising a National freestyle video comp which is judged by the public. To do it all we really need is a good web developer dude who has some free time and i can arrange some sweet prizes. Whos up for helping?? if we can get this off the ground then i'd be prepared to put the big effort into organising a nationals over here later on