Since the release of SQL Server 2005 Service Pack 2, Microsoft development team has released various builds that are classed as Cumulative Updates. Also we blogged on this site - CumulativeUpdate4 & http://sqlserver-qa.net/blogs/tools/archive/2007/10/16/keep-your-eyes-open-for-cumulative-update-4-for-sql-server-2005-service-pack-2.aspx
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Whenever a service pack is released it will be available for 32-bit and 64-bit that also includes for SQL Express 2005 edition too, as it was for MSDE earlier. Since last year (I think) Microsoft Development team has adopted a standard in naming schema
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