MSDN Library - Free
Microsoft has made MSDN Library available for free download now. It was earlier available only for MSDN subscribers. Users with low-bandwidth connections may not be really happy because the download size of the libarary (full) is more than 1.5 GB!!
Anyway, May 2006 edition of MSDN Library is here: http://www.microsoft.com/downloads/details.aspx?FamilyId=373930CB-A3D7-4EA5-B421-DD6818DC7C41&displaylang=en. Download and enjoy!