Just stumbled upon this handy list of Intranet Case Studies which sports quite a few big names. Although some are too vague in their presentation to really get an understanding of the described Intranet, there is still a lot of useful information, not to mention inspiration, that can be found there.
Some terms are too often used with only a rough and blurry definition of what they might contain and in which context they can be applied. I am as guilty of this as is every information worker. So, to make sense of terms like Knowledge Management, Internal Communications and eCollaboration, they have to be defined first. Regarding Information Architecture and User Experience, this article tries to incorporate these topics in a unifying concept. It is thoughtful, written with insight, and only the first in an upcoming series, so you are hereby ordered to read it – not only because it accomplishes the feat of simultaneously coining and explaining a new term along the way: the Enterprise-Wide Information System.