Australian Tax Office
This website has many online services available for individuals and for businesses. With the ability to download many of the required forms this is a handy site to have bookmarked on your computer.
www.asic.gov.au
www.ato.gov.au
www.fairtrading.nsw.gov.au
www.centrelink.gov.au
http://icaa.org.au
www.cpaaustralia.com.au
www.ausindustry.gov.au
www.osr.nsw.gov.au
www.ipaustralia.gov.au