Microsoft SQL Server is a relational database management system (RDBMS) produced by Microsoft. Its primary query language is Transact-SQL, an implementation of the ANSI/ISO standard Structured Query Language (SQL) used by both Microsoft and Sybase.
Links:
Microsoft SqlServer's Home - http://www.microsoft.com/SQL/default.mspx
Microsoft's SqlServer Developer Home -
http://crawlmsdn.microsoft.com/en-us/sqlserver/default.aspx
sqlserver central - http://www.sqlservercentral.com/
Microsoft SqlServer - http://en.wikipedia.org/wiki/Microsoft_SQL_Server
SqlServer Magazine - http://www.sqlmag.com/
SqlServer Tools - http://www.stylusstudio.com/sqlserver.html
SqlServer Tutorials - http://www.functionx.com/sqlserver/
Free SQL Server tools that might make your life a little easier - http://weblogs.sqlteam.com/mladenp/archive/2007/11/20/Free-SQL-Server-tools-that-might-make-your-life-a.aspx
SQL Server 2008 Books Online -
http://msdn.microsoft.com/en-us/library/bb543165(sql.100).aspx