The Windows Server System Reference Architecture is, I could not write it better than just a copy paste from the website itself:
WSSRA is a detailed reference architecture, tested and proven in labs, that yields valuable implementation guidance for meeting the requirements of an enterprise. Customers can use this guidance to build highly available, secure, scalable, manageable, and reliable enterprise infrastructure
Because I always forget this link for blue prints: http://www.microsoft.com/technet/solutionaccelerators/wssra/raguide/dataservices/igdsbp.mspx
For the complete reference http://www.microsoft.com/technet/solutionaccelerators/wssra/raguide/default.mspx