Some important information here for anyone developing SSIS packages.
As stated here by Michael Entin, Lead Developer for SSIS in response to a reported problem on Vista:
This is a known issue, which (together with other Vista compatibility issues) will be fixed by SQL 2005 SP2 early next year. For now, please don't use Vista machines for SSIS development
That's straight from the horse's mouth - don't use SSIS on Vista yet.
-Jamie