Flowchart for determining when the US copyrights in fixed works expire

Found this via BoingBoing. A handy dandy (?) little flowchart showing when works enter into the public domain. It mainly refers to "fixed works" where:

Fixed means fixed, by the author or with the author's permission, in a tangible means of expression, including, for instance, paper, CD-ROMs, film, or other media. The federal copyright statute does not cover unfixed works (such as oral stories or performances that have not been recorded or were recorded without the author's permission); they may be protected under state law.

After reading the chart and seeing the definitions it's all clear as mud now isn't it? ;-)