For the first time, Microsoft has made their MSDN Library freely available for download from Microsoft Downloads. Previously, it was only available for download to MSDN subscribers. Starting May 2006 all future releases would be made free for public.
Download details: MSDN Library May 2006 Edition
Update: The above link seems to be obsolete. The latest URL for this is http://www.microsoft.com/downloads/details.aspx?FamilyID=94596af5-cc58-45af-a14b-df627a31e783&DisplayLang=en
Technorati tags: Microsoft, MSDN