Share content between Wordpress sites in a network?

I have five different websites set up using Wordpress 3.0 Multisite. They each contain one page in common, which is a list of places. Each place is represented by a post in a specific category. What I want is that when I publish a new post in this specific category on one blog, it will add that post to all the other websites as well. Alternatively,开发者_如何学JAVA all websites pull their information from one single blog.

I don't really care how this is done, as long as I don't have to type in the same thing five times :/

---

RSS: FeedWordPress | simple and flexible Atom/RSS syndication for WordPress or WordPress › SimplePie Plugin for WordPress or Developer's Guide - Google AJAX Feed API - Google Code

---

Multipost MU has a nice interface, and can be set to publish to all sites by default.

---

There is a plugin - Diamond Multisite Widgets - that allows you to push new posts to other sites in a multisite network.