The skilled worker program underwent some changes in 2008 and is supposed to be getting faster. Immigration does not have any official timelines on the new program yet but you can look at trackitt.com to see some actual applicants timelines.
If you had applied as a skilled worker from Australia under the old rules, the waiting time would have been about 3 years. With the changes, they did not just make it faster, they also made it harder to qualify. Before, you just had to have at least one year of skilled work experience and 67 points on the self assessment. Under the new system, you also need to qualify under one of 3 categories, that is an occupation in the list of the 38 most wanted, to have a job offer or to have been in Canada for 12 months.