The Interactive Advertising Bureau in Canada has released a study on Internet growth since 2001.
Its results are hardly surprising: the Internet now surpasses newspapers and magazines in time spent among Canadians (TV and radio are still one and two) and stands to be the number one medium within years. What is interesting, though, is how the Internet usage mirrors other media's use, thus making a shift in advertising spending less risky.
The PowerPoint presentation of the study is below.