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[http://groups.yahoo.com/group/refactoring/message/5295 In defense of layered architectures] by Harald Mueller on the Refactoring yahoogroup.
[http://groups.yahoo.com/group/refactoring/message/5287 The problem with globals] by John Carter on the Refactoring yahoogroup.
[http://martinfowler.com/bliki/DatabaseStyles.html Database Styles] by Martin Fowler, discussing the difference between an Application Database and an Integration Database.