Service Pack 1 for Microsoft SQL Server 2005 is now available. You can use these packages to upgrade any of the following SQL Server 2005 editions:
- Enterprise Evaluation
Note: To upgrade SQL Server 2005 Express Edition, obtain the SP1 version of Express Edition or Express Edition with Advanced Services.
For a list of new features and improvements that are included in SQL Server 2005 SP1, review this KB Article.
Download at source.