Jaye commented here:

My other thoughts are about the need for anything at all. Are we past the age of intranets? Should we concentrate on disseminating good practice and let teachers use all the miriad tools available now and in the future

(Jaye had already expressed this sentiment on her blog).
It is a compelling idea. If I was still in the classroom I am pretty sure I’d be happy with using some of these tool myself rather than a set of nationally provided ones. When I was in the classroom I tended to use unconventional tools, self hosted pivot blogs and a pmwiki for example. I was happy researching and choosing what I needed.
However there are a couple of problems with this approach.

Services are often blocked in schools. I recall building A flickr CC search toy so that my bloggers could easily attribute pictures for their posts. Unfortunately I could not persuade the Local Authority that Flickr was a suitable site for children.
time: I was naturally inclined to spend a lot of time on the web, researching, setting up and playing around with the tools. Many teachers do not have that interest, time or sometimes the confidence in their ict skills.

These two problems were partially tackled by Glow. Glow provided a set of tools, eventually including blogs and wikis, that were otherwise unavailable in some Local Authorities. Glow also did. A great deal to encourage the penetration of ICT into the curriculum. Partially by giving teacher access to the tools but also by proving a fair bit of cash and other resources for training. The national push to get folk using Glow filtered via the Local Authorities into schools and classrooms.
I also believe that being a member of a community can be useful. A sense of being in it together, helping each other and having fellow practitioners with similar experiences and challenges could be provided by a national intranet. Although I am fairly indifferent to political nationalism I do feel identified as a Scottish educator.
Jaye also commented:

So far though, I can’t see how we could better Glew, or something similar.

No argument form me there.
Blogged with a hand knitted system