Hi Brian,

re:
> Looks like there can be groups of groups...

Yup, groups can be contained inside other groups.

Basically one of the main jobs for groups is if you have a more complex model where you would be trying to manage a list of say 100 named objects for example, you can use groups to arrange related pieces together. You can then collapse some of the groups so that the names contained within the collapsed groups will not be displayed for the moment and so you can work in the scene browser with a shorter visible list.

If you only have a relatively small number of objects where having their names all shown in one single list isn't really a problem then you may not gain very much with using groups for that type of situation.

There are some other things that groups can be useful for like making a set of objects select as one unit to keep them together more easily but hiding some names temporarily is probably the most significant thing.

- Michael