http://www.gro-scotland.gov.uk/
http://www.census-online.com/links/Scotland/
http://www.censusfinder.com/scotland.htm
http://www.scrol.gov.uk/scrol/common/home.jsp
Scottish Archive Network (SCAN)
Ayrshire & Arran Family History
Royal Historical Society - Victoria
At least the following sources of information have been used throughout the course of my family tree research International Genealogy Index
1881 Census for Scotland
Articles from Scottish Documents
1901 census for England - PRO
Public Record Office Victoria Australia - Unassisted Immigration Index