Take a look at these postings:
Loading and Running a Local Package Programmatically
http://msdn.microsoft.com/en-us/library/ms136090.aspx
Running SSIS package programmatically
http://blogs.msdn.com/michen/archive/2007/03/22/running-ssis-package-programmatically.aspx
----------------------------------------------------------------------------------------
Dan English - http://denglishbi.wordpress.com