I don't know what been done with the MSDN Library, but in the October release there are no Article IDs (ie Q123456) showing in the doucment. This is rather annoying when trying to help someone because you'd like to be able to provide the article number rather than the keywords so they can retrieve the document themselves.

I happened to right click an article, and noticed either something new or something that I had overlooked previously. The context menu had a Properties option. Clicking that brought up a properties dialog, and, lo and behold, there's the article ID (at least in the three or four cases I've happened to test).