Microsoft SQL Server 2005 SP4 is released

Service Pack 4 (SP4) for Microsoft SQL Server 2005 is now available for download. SQL Server 2005 service packs are cumulative, and this service pack upgrades all service levels of SQL Server 2005 to SP4 . You can use these packages to upgrade any of the following SQL Server 2005 editions:
- Enterprise
- Enterprise Evaluation
- Developer
- Standard
- Workgroup

SQL Server 2005 SP4 includes SQL Server 2005 SP3 cumulative update 1 to 11, customer requested fixes, along with instances of the SQL Server 2005 SP4 database Engine support for DAC operations.

link: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=b953e84f-9307-405e-bceb-47bd345baece&displaylang=en
link for the express edition: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=26435597-b28e-4568-9d16-017bdf47abdc&displaylang=en

There is also a SP4 released for the SQL 2005 feature pack.
The Feature Pack is a collection of standalone install packages that provide additional value for SQL Server 2005. It includes:
- Latest versions of redistributable components for SQL Server 2005
- Latest versions of add-on providers for SQL Server 2005
- Latest versions of backward compatibility components for SQL Server 2005

link: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=7768393b-71fa-4281-83eb-cab08be4fb76&displaylang=en