There is no "integration" in any special way. You just have to understand the way highlight maps are used for roll over creation, and once you do, you just export from AE a Quicktime movie and a suitable highlight map. It's a very manual approach, but very powerful. That's the kind of thing where the deepest way of creative control about your menus animation and look is. Motion does have several integration features, like the ability to open a Motion project file in DVD SP as if it was a movie or also the way it allows you to define and embed a menu loop point in Motion's timeline, but otherwise the workflow is the same.
Adolfo Rozenfeld
Buenos Aires - Argentina
www.adolforozenfeld.com