WordPress 3.3 introduces a new welcome panel designed to provide a better experience for new users installing WordPress for the first time. It’s a great idea, but one that may not work for all multisite installations. So I’m releasing a plugin that networks can use to dismiss the panel for new sites and users.
Try Hide Welcome Panel for Multisite, version 1.0. Only works for networks, and the plugin must be activated from the network admin.
Want to know how it all works? The plugin’s inline documentation contains the technical details.