Choosing a Tabular or Multidimensional Modeling Experience in SQL Server 2012 Analysis Services

http://msdn.microsoft.com/en-us/library/hh994774.aspx

Microsoft Enterprise Architecture

Here you'll find technical content, news, and community resources covering enterprise, application, and systems architecture.

Microsoft Application Architecture Guide, 2nd Edition

I highly recommend the Microsoft Application Architecture Guide, 2nd Edition for developing solutions using the Microsoft platform and the .NET Framework.

BI Architecture and Design Guide

BI Architecture and Design Guide.