Brian Knight's Performance Tuning SSIS talk from Tech Ed 2010 has been posted online.
Performance Tuning Microsoft SQL Server Integration Services
In this demo-rich presentation, learn some of the common and not so common ways to tune SQL Server Integration Services (SSIS). Learn how to tune the data flow using some of the advanced SSIS options and how to avoid common SSIS mistakes. See how to measure performance and how to keep SSIS from monopolizing your server's resourcing. Lastly, discover SQL Server 2008 features that will make SSIS more efficient.