Actually, this is already scheduled to be included in the docs which will ship with 1.0.2003.3 (not ready yet, will finish the docs in the comming week)
I've planned to include a section "How do I... " with examples how to do simple things and the more advanced things people run into.
I have to add that the documentation does contain a lot of these small examples. For example the transaction section does show how to insert a new entity and there are various others in the documentation. However, because these are not in a single place, it might be hard to find back that particular example how to do that particular thing.
The NW example was meant to be a 'look how it's done' kind of project, however due to the databinding hell, it turned out to be much more complex than anticipated (and it turned out to be more of a complex databinding example than a tutorial how to use the features).
Oh, btw, the NW samples does save new entities. The adapter version for example shows the recursive save functionality (soon released for selfservicing as well), for example when adding a new order to a customer. Changing the customer's fields also lets you save the customer entity. This illustrates that 'save' is transparent: does it update or insert? it doesn't matter, it saves the entity's data back to the database.