Hi eric - actually object names are part of v2, you don't even need the latest v3 beta to use them.

But in order to use the Objects section of the scene browser, you first need to assign a name label to one or more objects.

To assign a name, first select the object you want to name, and then the properties of that object will be shown in the properties panel in the upper-right area of the main window, here:



That shows some information about the properties belonging to the current selected objects, including object name, object type, the style that is assigned to it and its size. Some more information on the properties panel here:
http://moi3d.com/2.0/docs/moi_command_reference11.htm#propertiespanel

You can also edit the information that it shows there in addition to just seeing it - to edit it move your mouse over that panel and click on one of the lines that highlight. So for example to edit the object name, move your mouse over top of the first line which shows the object name (it will say "unnamed" if it does not have any name assigned to it yet), and you will see it highlight like this:



Click on it, and then the "Edit object name" dialog will pop up and you can then type in a name and push Enter, that will assign a name to that object:



Now that you have assigned a name, an entry for that name will appear in the "Objects" section of the scene browser, and you can use the controls there for various tasks like hiding, showing, selecting, or locking the object.



Also some more information on how the scene browser controls work here:
http://moi3d.com/2.0/docs/moi_command_reference11.htm#scenebrowser


Basically, it's another method you can use for organizing your objects in addition to using styles.

- Michael