Chris has posted a great video demo of the mass modelling tools in ADT 2004/5 on his "Between the Walls" Blog. While massing has always been a part of ADT the interface and object improvements in ADT 2004/5 have made mass elements a powerful tool. The video is a good introduction if you haven’t seen this in action.
Between the Walls: Mass Modeling Ease-of-Use in ADT 2004/2005 - Part 1
As many of you upgrade from versions of Architectural Desktop prior to 2004, or if you are a new user, you might not be aware of the user interface improvements made to the mass modeling tools inside of Architectural Desktop....