Here are some e-resources for pop culture/history (historical highlights, inventions, fads, fashion, sports, movies, tv, music, etc.) Might be helpful for a decades project. These links focus on American people and events, but will often have some relevance to a Canadian context.
(Thanks Annette Farmer via LM-NET)
For more Canadian content, check out the following:
Archer Audio Archives
American Cultural History: 20th Century
20th Century: Media History Project: U of M