MongoDB Data Model

http://docs.mongodb.org/manual/data-modeling/
http://docs.mongodb.org/manual/core/data-modeling-introduction/
http://docs.mongodb.org/v2.4/MongoDB-data-models-guide.pdf
http://www.doctrine-project.org/blog/document-oriented-databases-vs-relational-databases.html
http://www.mongodb.com/learn/nosql
http://odbms.org/download/IntroMongoDBChapter%203.pdf

http://www.mongodb.com/presentations/webinar-relational-databases-mongodb-what-you-need-know-0

http://planet.jboss.org/post/planning_to_migrate_your_relational_database_to_mongodb