But many a times architects often comes under fire, when they are asked to submit different documents describing application architecture, development environment configuration, capacity and sizing estimates for a technology that has not got inducted within the organization through SOP. Architecture has significantly changed from Sharepoint 2007 to Sharepoint 2010, the primary one being the change from Shared Service Provider (SSP) in 2007 to Service Applications in 2010. Services that can be used/categorized for BI related requirements can be managed in the form of service applications. Examples of such services are Access Database Services, Secure Store Service, Visio Graphics Service, Business Data Connectivity, Excel Calculation Service, and PerformancePoint Service.
This was just the tip of the iceberg, and when you have Sharepoint 2010 as a part of your BI solution, the journey of an architect just starts with selecting services of use followed by capacity planning and related documents for infrastructure and storage teams. In such cases, there are some tools, reference topologies, and architectures that can make your life a bit easier as an architect. Below are link to such resources:
1) HP Sizer for MOSS 2007
2) HP Sizer for MOSS 2010
3) Reference architecture and topologies diagram
4) Reference architecture and topologies reference material