Официальные источники статей по Sql Server

Sql server 2005
http://technet.microsoft.com/en-us/library/ff928326(SQL.10).aspx

Sql server 2008 Community Articles
http://technet.microsoft.com/en-us/library/cc872864(SQL.100).aspx

Sql server 2008 SQLCAT Articles
http://technet.microsoft.com/en-us/library/dd334464(SQL.100).aspx

Sql server 2008 Microsoft White Papers
http://technet.microsoft.com/en-us/library/ee229554(SQL.10).aspx

Sql server 2008 R2 Microsoft White Papers
http://technet.microsoft.com/en-us/library/ee410014.aspx

Sql server 2008 R2 SQLCAT Articles
http://technet.microsoft.com/en-us/library/ff645399.aspx