UPDATED: Join Together v5.1.1
Join Together has been updated to version 5.1.1. This AppleScript Studio application will enable you to join the files of selected iTunes tracks together with QuickTime and export them as a single AAC file/track. Optionally, with Apple's ChapterTool application installed, you can then create a "chapterized" audio file of the exported AAC file with pointers to the individually joined tracks.
This is a minor fix release that fixes an error that occurred at startup when attempting to generate a Genre names list from the XML file of a loaded multiple library ("Can?t get items 1 thru -2 of {??}. (-1728)") and prohibits auto-selection of every track in the "Music" or "Audiobooks" playlist when no specific tracks have been selected.