If you catch something highly transmissible (eg, gastrointestinal illnesses) during the conference, please do not attend the conference that day and give the organisers a heads up. linux.conf.au has had major problems with outbreaks of gastrointestinal problems before.
For emergencies requiring immediate medical attention or for a crime in progress or similar (not trivial stuff), you can contact fire, police and ambulance operators as follows:
I need an ambulance
Ambulance service in Tasmania is free. Call 000.
Non-emergency medical care
If you find yourself in need of some medical attention while you're in Hobart there are lots of options around Sandy Bay and Hobart generally.
I need to see a general practitioner (primary care doctor)
The Uni Doctors are located on campus in the University Union building: Phone (03) 6226 2102
If you can't get into either is a list of many other general practitioners; look for the ones in Sandy Bay and the city. http://www.gpsouth.com.au/directory_body.html Note not all GPs are interested in taking new patients.
It's after hours and I need to see a GP
The After Hours Doctor is an emergency clinic located at 252 Main Road, Derwent Park, not far from Hobart (about 15 minutes in a cab), open only on weeknights, weekends and public holidays. You can rock up without an appointment, but you can call them on (03) 6274 4250.
I need to go to hospital