Content syndication across sites

Hi,

We are running a multisite system that will have latest news for an appropriate category. Say for example we have Site A, B, C & D.

Now, when one of our editors publishes a post on site A, they should have the option to instantly syndicate this content to site B, C or D - this should include all images. If an editor then logged into site B, C or D, the content should be visible and editable on that particular site.

Is this possible with an existing WPMU plugin or any other way I can achieve this?

Thanks,
Chris.