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It contains 1 (AGI & SCI versions) through 6, King's Questions, Graham's Board Game Challenge. It contains all of the bonus material from the 15th Anniversery Collector's Edition, and added a playable demo of KQ7.
King's Quest Collection Series (1997)
Also known as King's Quest Collection 2; it contains 1 (AGI & SCI versions) through 7 (2.0 version), King's Questions, Graham's Board Game Challenge, Wizard and the Princess, Mixed-Up Mother Goose Deluxe, Laura Bow 1 & 2, Mystery House, Mission Asteroid, and Time Zone.
It contains most of the bonuses from the previous versions including; Developer's Shield, Royal Scribe, and Chest. It does not contain all of the videos from the previous versions. It contains making of and intro videos for KQ6, and the intro and ending videos for KQ7. It has an added Sneak Peak of KQ8: Mask of Eternity.
Roberta William's Anthology (1997)
It contains KQ1 (AGI & SCI versions) through 7 (2.0 version), Wizard and the Princess. It also contains Laura Bow 1 & 2, Mixed-up Mother Goose (AGI & VGA versions), Mystery House, Mission Asteroid, Time Zone, Dark Crystal, and Chapter 1 Demo of Phantasmagoria.
It contains only the Chest & Developer's Shield. It also contains box covers, and KQ7 concept art. Videos contain some of the videos from the first collection (that were not included in the "Collection 2"), and more interviews from the development teams, and a different Mask of Eternity sneak preview.
King's Quest Collection (2006)

This collection was released on Steam in July 2009