Customize your WordPress log in screen with WPMU DEV Login Message plugin. You can display any message above the username field and can replace the default WordPress logo with your branding. In addition, you can show any footer message and can remove password reset options. Like all WPMU plugins, Login Message plugin is also compatible with the multisite network.
This is the EXACT same plugin as distributed by the developer on WPMU DEV. The developers’ links are provided above.