A production diary is a live account of the making of a film for promotional purposes in the form of a video podcast. Production diaries follow different aspects of movie production while they are happening. Web-based production diaries are a new way for film makers to publicize their productions as they are being created, rather than when they are released (the old-model of film marketing).
Examples of current web-based production diaries include:

King Kong (2005) – KongisKing.net
Superman Returns – BlueTights.net
Nacho Libre – nacholibre.com (xml feed)

see more at wikipedia

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