Steve Howard - the same guy who previously provided detailed clustering advice on this blog - has posted an article that includes 3 different approaches for retrieving Active Directory information in an SSIS package. The article includes screen shots and code samples. As Steve explained to me, "Bits and pieces are available on the internet, but nothing to really put it all together to allow someone to see how to do it."
Processing Active Directory Information in SSIS
Steve works for Microsoft Services as a Premier Field Engineer for SQL Server in northern California.