January 1st is Public Domain Day, as noted by copyrightwatch.ca:
Welcome to 2008, and let’s welcome into the Public Domain thousands, indeed millions, of creative works from the collective cultural past of our little planet and its many countries. Yes, it’s January 1st, Public Domain Day in most countries of the world, where copyright runs from the death of the author of a work until the end of the 50th, 70th, or some other year thereafter.
Read the whole post for some notable works falling into the public domain in some jurisdictions.
Everybody’s Libraries also has an informative post about Public Domain Day 2008.
A post from Lessig on Public Domain Day 2004.
Creative Commons offers a public domain dedication and we’ve announced that we’ll be upgrading and extending that this year with the CC0 project.