Doug Adams has released Join Together v3.2, a free script that enables users to join the files of selected iTunes tracks together with Quick Time Pro and export them as a single AAC file/track. Optionally, with Apple’s ChapterTool application installed, it will create a “chapterized” audio file of the exported AAC file.

Requires:

iTunes 4.9 or better (iTunes 6 preferable)
Mac OS X v10.4 or better
QuickTime Pro v7.0.1 or better
ChapterTool (required for creating “chapterized” AAC’s)

More info and download link here.

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