Surprisingly given the (a) amount of wilderness we have and (b) propensity for Aussies to sign up for stupid things the ultra (not really) racing thing has yet to take off in a big way... until now...
Ok, shameless promotion.
I'm planning on riding the Mawson Trail (
http://www.southaustraliantrails.com/top_trails.asp?mawson) - a 900km trail that winds its way from outback South Australia, through the Barossa and Claire valleys and eventually ends up in Adelaide with a view to hopefully establishing this as a more or less annual event.
The inaugural (not-so) grand depart is set for 19th April 2013 in Blinman (one pub town...).
If you want more info feel free to PM me or check out the event page at
http://mawsonmegamarathon.blogspot.com.au/