I know people have asked for a complete object outliner in the past ala Maya/Blender et al where you can see every individual object.
I think a more useful/realistic thing would be for something siilar, but in respect to groups. In the same way layers are so essential, groups are too. I think Groups should have their own panel (Eto style) so you could see all groups in a 3DM file. The group names tool is okay but quite manual. I think a UI similar to layers would be nice so that you could add objects into a group via buttons, remove, combine groups into one, collaps and expand subgroups and so on.