I came across this the other day and thought that a lot of you would find it useful so here you go. If you haven't seen this before, it's part of a series of planning and design guides that clarify and streamline the planning and design
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Read the complete post at http://blogs.technet.com/softgrid/archive/2008/06/30/app-v-the-infrastructure-planning-and-design-guide.aspx