The SQL Server Books On Line have been updated and are available for download. Having your local copy is important when you develop off-line, or if you have a slow connection. Just like your software should be kept up to date, so should your documentation. Click on the link below to be taken to the Microsoft site to download the books on line.
SQL Server 2008 Books on Line Update
Even though they haven’t been updated in a bit, if you have never updated your SQL Server 2005 Books you should do so from the link below.
SQL Server 2005 Books on Line Update
If you do prefer to read on-line, you can jump right to the MSDN site for SQL Server 2008 Books on Line at http://msdn.microsoft.com/en-us/library/ms130214.aspx. The 2005 version is at http://msdn.microsoft.com/en-us/library/bb418498.aspx.