No field is in demand, not even in nursing. While australia does need more nurses there are not enough nursing grad positions.
You could look into allied heathcare like physio or similar.
I've written a blog about career choices and compiled news articles regarding the job market. here:
http://boringgamenow.wordpress.com/
The only thing that is in demand is surveying. So if someone were to ask me which bachelors degree has a high employment rate that would be it. Everything else is BS and I can explain to them why, but you see I don't have the time to give free advice.
There's no such thing as in demand. Even the seek article on what's hot in the future is a misleading scam. Ask any accounting uni student right now and they will be will sad.
Even for surveying if 1000 people in NSW were to study it, they would not be able find jobs easily. Right now very few people study it so, you could pretty much get a job.
Each year over 8000 students get atar/uai over 90. That's a huge F number. Look at how many jobs ad posted around. While it is true that most jobs are advertised internally, it still means that employers do no need to post online. Ask any employer right now, they are swamped with applicants.