Below are some helpful and informative links.

Professional sites
CPA Australia - www.cpaaustralia.com.au 
National Tax & Accountants Association - www.ntaa.com.au

Tax Office sites
General tax information - www.ato.gov.au
Tax information regarding superannuation - www.ato.gov.au/super/
Individual taxpayer information - www.ato.gov.au/individuals
Tax information for Businesses - www.ato.gov.au/businesses/
Individual Tax Rates - www.ato.gov.au/individuals/tax rates
Deduction essentials, including deductions by job type - www.ato.gov.au/individuals/deductions

Other useful sites
ABN lookup information - www.abr.business.gov.au
Company name search - www.edge.asic.gov.au/gns001.html
Victorian Business Name Registration - online.justice.vic.gov.au/servlet/cav_home
Family Assistance Office, Family tax benefit Part A & B - www.familyassist.gov.au/
Centre link information - www.centrelink.gov