I recently came across an interesting Research report that was conducted in October 2007. It was commissioned by Google and they wanted to see what the relationship was between Newspaper Advertising and Internet searches. What they found was that 44% of respondents stated that they head performed further research on Businesses or Products that they saw advertised in a Newspaper. Of that 44% who researched, 67% conducted the research online (Internet). Furthermore, of those that researched further, approximately 70% went on to use that Business or purchase that Product.
Now admittedly, this is a US research and it is over 18 months old. But I would suggest that Australia isn't that much different to the US and if anything, the last 18 months would probably see an increase to this as Internet Usage grows overall. Read the full article