Doug's AppleScripts for iTunes - Managing Files: "Make Bookmarkable
written by Doug Adams
posted: Mar 1, 2004
This script will change the 4-character file type of the selected AAC tracks to 'M4B ', thus making them bookmarkable. (That is, the track will resume playing wherever you left off the last time you played it.) Works on protected and non-protected AACs."
Very handy for my medical CME lectures.