The Admin message plugin, is similar to Admin ads plugin.
Both provide the ability to easily place a message that is displayed on every page inside all dashboards of your site.
Admin message is great for an important message that you want always displayed such as letting users know of scheduled maintenance or a great new feature.
Admin panel tips plugin
Admin messages work well in combination with Admin panel tips plugin.
You use the Admin panel tips plugin for providing a series of helpful tips and links that change as the user navigates inside their dashboard.