InDesign Secrets shared this excellent InDesign script that converts your layered InDesign file to a layered Photoshop file.

Mike Rankin takes you through the simple steps in the article, but I’ll tell you from experience that this is the sort of thing that is best left to designers who are obsessive about details like naming and organizing their layers, regardless of what program they’re working in. And as Mike points out, this is something that is best left as the “final” step—as you won’t know (or have a whole lot of control over) what remains editable after the conversion.