iTunesJoin is a set of applications that lives in the scripts menu of iTunes and allows you to join (concatenate) multiple tracks into a single new track.

You can:
• Join AAC audio tracks into a new AAC audio file without quality loss;
• Join any tracks (except protected AAC) and convert the joined file according to iTunes import preferences;
• Join any tracks (including protected AAC) into a QuickTime movie (without quality loss) that can be played by iTunes (but, unfortunately, not by iPod);
• With the optional ChapterTool software from Apple, automatically create chapters for easy navigation (of AAC files).
• iTuneJoin is particularly useful for audiobook listeners and those who want to join music tracks gaplessly (note: there may still be a short gap).

Limitations: If you use any of the files you produce with it, you are required to purchase a license. iTunesJoin will function for 30 days after it is first used; an additional 10 day trial can be initiated any time after the first trial period expires. Upon expiration of the second trial, you will need to purchase a license to restore functionality.

Requirements:
OS X 10.3.9 -10.5
QuickTime 7.0+
Universal Binary