[From SQL Server Magazine]
With the arrival of SQL Server 2008 we gained access to a new feature called Change Data Capture (CDC). CDC enables you to constantly stream change data to a consuming process, most notably Extract, Transform, and Load (ETL) applications. In the SQL Server environment the ETL application used is of course SQL Server Integration Services (SSIS).
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http://www.sqlmag.com/Articles/Index.cfm?ArticleID=100797