In a 9-0 decision, the Supreme court ruled that ISP's (Internet Service Providers) are not libel for actions of the people they provide Internet connectivity to.
Why do you care? (Sorry for the heavy use of abreviations, but I'll link for more info)
In the US, organizations like the RIAA are using provisions in the DMCA to force ISP's to give them the names of people the RIAA believes are illegally 'pirating' music. This is a daunting task, and they tend to get it wrong, and end up suing people who did not download music. The RIAA usually wins, because the lawsuits are civil, rather than criminal, and the standards for proof are much more lax. People don't have the money to defend themselves against a Lawyer Army, even if they are innocent.
In Canada, the supreme court has already rejected this tactic, ruling that there was no way for the industry to tell what these people downloaded or uploaded to the internet.
Now, why do you care? Every piece of digital media that can possibly hold digital information, and by it's nature hold 'pirated' data, is already subject to a levy which is supposed to be given to SOCAN or CIRA artists. Blank CD's DVD's, Computers, MP3 players all carry the levy which is in addition to VHS and cassette tapes. To date, not a penny of this levy has been given to artists.
Do you know what is installed on your computer? Has someone installed KaAzA, or Bearshare or Limewire on your computer, and is your computer sharing songs on the Interent? Do you have $4000 for to give the recording industry's Lawyers when they come knocking to settle out of court? Today the Supreme Court stood up for individuals and is forcing the big corporations to prove things before they start fleecing the Citizens of Canada.