TkDC++ is the most simple and lightweight DC client available today. It can be used by the beginner and in a few minutes be downloading from DC. The more advanced user can also use it, as the advanced options can be selected.
This is a little program that makes WScipt (windows script) that maps network drives on a windows computer. In Active Directory you can set this as a login script so that all your clients have the mapped network drive(s) that you have made.