At first glance, iMovie 4 looks identical to iMovie3. But under the hood, dozens
of annoyances have been eliminated and dozens of polished touches have been
added. The program tweaks include: editing enhancements, better navigation, and
audio improvements. iDVD 4 has undergone a more thorough overhall that makes
DVDs look even more like a commercial Hollywood DVD. iDVD removes many of the
limits in the previous versions. Improvements here include: increasing the
number of buttons on a menu page from 6 to 12, extending the background music on
the menu screen to 15 minutes, allowing up to 99 chapter markers, and extending
the amount of burnable video