The station I worked at over the summer in Dallas uses iNews. I liked it a lot partly because there is a feature that acts almost like an instant messaging program. I had quite some fun with that especially during a boring Saturday afternoon. As long as the person has a username in the system you can send them an IM and a "ding" notifies them that they have a message. If they're not logged on, not to worry, it will stay saved until the next time they are on. Anyway it's good program and everyone at the station liked it as well, for more reasons than mentioned above.
Editor's Note: Ah, I can see the potential of annoying your coworkers. I like this program already.