You will find much (free!) information at the SAS support http://support.sas.com/ website, for example, either using the SEARCH option at the website or using a Google advanced search argument, such as the one below.
Google advanced search arguments, this topic / post:
In addition to Scott's excellent suggestions, there is a difference between the architecture of "Foundation SAS" and the architecture of the SAS Platform for Business Analytics (also known as the BI Platform). For a deeper understanding of the SAS Platform for Business Analytics, you would want to look at the Platform Administrator documentation and overview documents -- also available via a search of the SAS web site.
I saw this post and would like to append to it as my question is sort of in the same vein as this one. I'm extremely new to SAS and will be dealing with it from an engineer perspective (system maint, monitoring, etc). Between the all the tiers and components involved - Weblogic App servers, MySQL DBs, stored process servers, and metadata servers - I am having a difficult time determining where to start with all the free info on the SAS site. I cannot attend a class right now, but would like to know from some seasoned veterans where I should focus my efforts to achieve the best foundation for SAS.