alot of good points already.

Just thought I would add:
- you may need to pay an independant certifier (not sure about all the states, but this is a requirement in ACT) they cost about $3000.
- mailbox, clothesline
- (in ACT) you are also required to have a water tank, connected to the toilet and laundry; and in some suburbs, solar hot water systems. So ceck out with your local council any extra's you may be required to have

Basically go through the inclusions list with a fine tooth comb before signning anything. On the current house we are building It took us four weeks of going back and forth about the inclusions in the contract.