tangor - 1:56 am on Feb 17, 2012 (gmt 0)
I provided the link above for a reason. It has all that info, plus the 1932, 1964, 1972 etc. exceptions, and the handful of public domain possibilities which do not fit with any of the above. :)
Additionally, it defines the terms of 50, 70, 95, and 120 years which can applied, as well as define the difference between corporate work and creator work.
More fun, discusses Trademark and how it is applied, which often comes up during copyright discussions.