iDVD 4.0.1

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Apple also updated iDVD to 4.0.1 today:

This software update will upgrade your version of iDVD 4 to iDVD 4.0.1. This update is highly recommended for all users of iDVD 4 and will provide for improved reliability when authoring and burning DVDs.

This is the first iDVD update since the release of iLife in January.