Hi All,
Thought I will share this from p&p. This will be of great help for all those who debate on how many layers are required and how they need to interact with each other.
http://www.codeplex.com/AppArch/Wiki/View.aspx?title=How%20To%20-%20Structure%20Your%20Application&referringTitle=Layers%20and%20Tiers
Hope his helps
--Pavan
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