Apple has been sued for the second time by the non-practicing entity Personal Audio, which accuses Apple of patent infringement related to downloadable playlists. FOSS Patents reports that the new filing comes just weeks after Personal Audio was awarded an $8 million jury verdict in a case involving the same patents in relation to the iPod classic, iPod mini, iPod shuffle, iPod nano, iPod touch, and iPhone. The new case focuses on the sixth-generation…