Microsoft has released the Service Pack 4 for SQL 2005.
This may be the last SP for SQL 2005 – think to move to newer SQL version.
SQL 2005 SP 4 includes SQL Server 2005 SP3 cumulative updates 1 to 11, customer requested fixes, and the SQL Server 2005 SP4 database engine support for DAC operations.
You can download Service Pack 4 from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=b953e84f-9307-405e-bceb-47bd345baece&displaylang=en