I am designing an enterprise application which will be used in 12 different countries and accesed by 50k users. It will be a proformance based management system with lots of user data and business rules. What I need here is an architechtural diagrams or guidelines to design system and application architechture. I will be focusing on both physical and logical designs which can use any suitable technology from grid, cloud computing to silverlight or a combination of different technologies to improve performance and user experience.
Your suggestions and inputs are well come.