From the horse's mouth 😀
http://www.microsoft.com/sql/2008/prodinfo/newfeatures.mspx
Don Schlichting also wrote a few good articles on some of the new features available in 2008.
http://www.databasejournal.com/features/mssql/article.php/3691821
http://www.databasejournal.com/features/mssql/article.php/3697056
http://www.databasejournal.com/features/mssql/article.php/3702381
Tommy
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