Authenticating users and uploading content with Services module I am trying to learn how to set up a service that will accept http-posts including user login and password, authenticate the user, then allow the user to upload a file that will be used to create a new piece of content.  I could not find any good resources explaining how to handle user authentication with the services module nor did I find any good resources about how an upload or content creating could be accomplished.  Does anyone know of any such resources I may have missed?
http://drupal.org/node/736522 should help you.