Posted: Fri Jul 04, 2008 4:28 am-
British Commonwealth people do NOT get any specific preference for Australia immigration.
However, Canada is classified as a "low-risk" country (there are 29 of them I think) which does expedite things by a few months (less security checks etc). (being low-risk has nothing to do with commonwealth, other nations on this list includes USA, Japan, and much of western Europe). Because your wife is from India, that could slow things down as it isn't on the "low-risk" list. If you haven't been a Canadian citizen for at least 10 years yourself, that may also slow things down as background checks etc. will be more difficult.
For skilled immigration points, because Canada is also classified as a major English-speaking nation (others are USA, UK, Ireland, and New Zealand), Canadians also get an automatic 15 points for English language ability with no evidence required. (If you need 20 points for this category though if you're short a few of what you need for the visa, you'll still need to take an exam).
You should also get used to that when Australians refer to the "Commonwealth" as part of their vocabulary, they're talking about Australia itself and it's federal government (the "Commonwealth of Australia" and "The Commonwealth Government"), not the British Commonwealth.