Chung, I started doing a series of articles for DTS on my blog (http://philcart.blogspot.com/search/label/DTS), but I shelved it after looking at the Package Configurations in SQL Server 2005 Integration Services.

These articles have some info on Package Configurations in Integration Services,

http://www.sqlis.com/26.aspx

http://vyaskn.tripod.com/sql_server_2005_making_ssis_packages_portable.htm