check - http://www.immi.gov.au/allforms/application-forms/forms-summary-changes.htm
Form 1066 had essential changes in March 2014. form can be found at http://www.immi.gov.au/allforms/application-forms/forms_num1.htm
But 457 visas are online applications - http://www.immi.gov.au/Services/Pages/employer-sponsored-workers-online-applications.aspx