UPDATE: April 2007 MSDN library available @ http://www.microsoft.com/downloads/details.aspx?FamilyID=b8704100-0127-4d88-9b5d-896b9b388313&DisplayLang=en
Updated content sets in this April 2007 Edition include:
Now this is awesome news. The MSDN library iso's (cd images) which used to be subscriber only downloads are now free. And I believe(hope) all the future releases from now will be free downloads as well.