This is what I've been thinking. Travel between the U.S. and Australia is almost as easy, as traveling between each state.
The visa waiver gives you 90 days.
I've mentioned before on these forums about my previous job with a lot of shady individuals and I saw first hand just how easily the visitor waiver can be abused.
Gosh, the first time I went to Australia, prior to Sept. 11 the day I purchased the airline ticket, the ETA (Electronic Travel Authority) was initiated, just before arrival the flight attendants passed out a form and all I remember about it, was having to sign my name and date it.
The last the time I went, after the Sept 11, the only difference from prior trips, I had to pay a processing fee.