This plugin removes the nag notice at the top of WPMU plugins and themes.
WPMU has great themes and plugins. Unfortunately, many, if not most, come with a nag notice that admins see about installing their notifications dashboard plugin. If you've bought one plugin for your site this is probably overkill. If you're a developer you don't need this on your client's sites.
This is a simple plugin that removes the notice.
Note: If you do decide to you install the WPMU notifications plugin, please deactivate this one first. Errors may occur if you don't.