A new poster talking about N-Tiers has been added in the downloads section.

N-Tier, or Multi-Tier, architecture is a way of developing applications with components that work together to provide functionality in a clearer, more logical way. Components are logically arranged based on their functional requirements and rely on communication agents between components to provide input and output.

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Wiki have more information regarding Multi-Tier Architectures at their site at http://en.wikipedia.org/wiki/Multitier_architecture