What Could Have Been Entering the Public Domain on January 1, 2011?

Center for the Study of the Public Domain: "Current US law extends copyright protections for 70 years from the date of the author’s death. (Corporate “works-for-hire” are copyrighted for 95 years.) But prior to the 1976 Copyright Act (which became effective in 1978), the maximum copyright term was 56 years (an initial term of 28 years, renewable for another 28 years). Under those laws, works published in 1954 would be passing into the public domain on January 1, 2011.