Via Chris Rush Cohen, a political satire of THIS LAND IS YOUR LAND here.

Via CopyFight, an iPOD satire here.

Things to think about.  What percentage of the original work is copied?  Is the ‘target’ of the satire/parody the original work, or some other topic?  Does the satire/parody compete with the original work?  Is the satire/parody a form of political speech?  Is the satire/parody funny (that question isn’t legally relevant but is a consideration if you decide to repeat the joke to friends).