There are many Astronomy enthousiast around the world which means that there are many clubs and organisations that are devoted to Astronomy.
I am a member of rge Astronomical society of Victoria (ASV) since 2005. Please see the page below for more information.
Other societies, clubs and organisations include
Astronomical society of Melbourne http://www.astromelb.i.net.au/
Astronomucal society of the Pacific http://www.astrosociety.org/
Astronomical Society of Victoria http://asv.org.au/
Bendigo District Astronomical Society http://www.bdas.net/
Mornington Peninsula Astronomical Society http://www.mpas.asn.au/
Latrobe Valley Astronomical Society http://lvastro.org/
Australian Amateur Astronomy http://www.iceinspace.com.au/home.html
Australian Astronomical Societies http://www.quasarastronomy.com.au/society.htm
NASA http://www.nasa.gov/home/index.html?skipIntro=1
NASA / IPAC Extragalactic Database http://ned.ipac.caltech.edu/
Southern Sky Watch http://home.mira.net/~reynella/skywatch/ssky.htm
Science Works http://museumvictoria.com.au/scienceworks/