Cross-post on multiple WP blogs?

I am wondering if this is possible. I have several WP blogs running on the same server, and was wondering if there was an easy way [ie from the main admin interface of one of them, ideally; not involving a cut-and-paste, repost, or copying entries in the db or anything] to create a cross-post on all or some of them. If so, would the categories get messed up, or could it work if all the blogs had at least one shared category?

Not sure if this is possible… any ideas are welcome!
Thanks!!