My comment appears to have been caught in the spam trap on the ThoughtFarmer blog, so here it is:
Nice post – this is a good time to be having this discussion. However, while we’re referencing past definitions I might point you at my 2005 post on the “intranet imperative”:
Also, Digital Workplace (which I’ve heard coming out of the old school intranet community, while others are talking about Social Business and Enterprise 2.0) reminds me very of much of Forrester’s Information Workplace concept from about the same time – see:
Personally I have no problem with the term ‘intranet’ but its worth exploring other terminology to generate discussion and understand what is changing.