The following link is an Adobe Acrobat PDF formated tabloid sized printable architecture diagram that shows the major products and databases supported by the SAP BusinessObjects Business Intelligence 4.1 platform. Mouseovers describe each component. This vector drawing can be printed on large format poster plotters.
http://help.sap.com/businessobject/product_guides/sbo41/en/sbo41_bip_architecture_en.pdf
To see the Adobe Flash version of the 4.0 architecture, see:
http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/904a8965-c767-2f10-829f-aecac7496de3&overridelayout=true
To see the process flow tutorials that explain component interaction, see: