Tim,

The little bit that I know is that the DTS migration tool will work for simple DTS packages, but some of the more complex ones will not convert because there is no exact match for some of the DTS functions in SSIS.  Microsoft has a SQL2005 "add-in" you can download that allows 2000 DTS packages to be run & edited in SQL 2005. That's the route we will take initially, then re-write the 2000 DTS packages as 2005 as time & need dictates.

Where I am working, a consultant used the migration wizard for dts->ssis and it has seemed to work well.  You cannot use ActiveX scripts, they must be converted to .net Script tasks, but there is additional functionality in ssis and you may not need them any more.  There was a glitch though, dts package names cannot have spaces in them or the wizard will hang up before it shows a list of migrate-able packages.