My HECS fees are deferred, and I pay for pretty much everything else (rego, insurance, clothes, my social life, mobile phone, GSC, textbooks, all expenses related with going on prac, etc)
My parents do pay for food (but only at home, they don't pay for my lunches at uni, or if I want to go out to dinner-unless its with them, or anything like that)...oh, and they pay for my fuel too (~$30/week).
EDIT: I don't pay board either...but really, the expenses of having me at home aren't THAT huge...we're on tank water, so there is no water bill...I don't contribute that much towards the electricity bill...and I don't eat that much, so my contribution to the grocery bill is also minimal. So apart from a tiny bit of food, tiny bit of electricty, and my fuel, I'm really not costing the parentals that much. Besides, they like having me at home and don't particularly want me to leave just yet.