Good wordpress sitewide message system plugin

I need a 开发者_开发知识库plugin for wordpress that will allow people to put a message at the top of the site that may state things like upcomming events or notifications of outages of our server..etc...etc.. Anyone know of a plugin that can do this?

All the one's I've found like WP Announcement and Announcer don't seem to handle this very well. I cannot have the modal popup either.

I would suggest a roll your own version. Using a plugin framework, like PodsCMS can help with this and even make it manageable with custom admin menus. This combined with the Adminimize plugin can even help with restricting access to this feature on a user role basis.