A lot of sharepointers are mesmerized while making the choice between site collections, top level sites and subsites. While I have discussed in my previous blogs about the guidelines of when to use site collections and when to use subsites, I will advise my friends to view the planning roadmap for sites and subsites on the Microsoft official website.
Microsoft recently created chain of content for end-users as part of the program Everyday Productivity Education (EPE). These customizable productivity aids were built for MS products so that employees can make best use of the technology. They also contain content specific to SharePoint products and technologies specially in the context of improving productivity in an intranet culture.
The details can be found at: http://technet.microsoft.com/en-us/library/bb687781.aspx