Jamie Thomson has posted four SSIS lookup component feature requests that have been recently closed as “fixed” by Microsoft. Hopefully these will make it into the next CTP of SQL Server 2008. Take a look because they all have very high potentials to increase your productivity and useability of SSIS.
See them here: http://blogs.conchango.com/jamiethomson/archive/2007/08/21/SSIS_3A00_-Big-improvements-to-Lookup-in-SQL-Server-2008.aspx