I would still really love a more robust API for this kind of thing. I should be able to authenticate a third-party to see all of my circles and pull posts out based on Circles and push posts into G+ to particular circles.
For example, if I use a social bookmarking site, I should be able to have something like ifttt.com
watch that bookmark, see any bookmark with a tag "to:plus" and "circle:friends" and then ifttt.com
can trigger a new G+ post to my friends circle that contains the URL as a link post and my note as the comment.
This basically level of functionality is really required to ensure that I can move content conveniently into Google+ as an integrated part of my workflow.