How get a list of all Nodes

Returning *all* of the nodes in a single Services call could be a pretty big operation depending on how many nodes you have.

The easiest ways to do so however would be to create a basic view (using Views.module) which returns all of your content and then use a views.getView(), or to throw all of your content into a taxonomy term and use taxonomy.getTree() to retrieve them.

Yeah, I would do what bmcmurray suggested, and create a View called something like "AllNodes", and then use views.getView to return all the nodes returned from the AllNodes view.