The Customized Sign In Templates plugin enables MT4 sites to customize the commenter sign in and registration screens. MT4 include built-in support for commenter registration and login. By default, the screens where commenters login and register are system templates that bear the Movable Type logo -- they can't easily be customized to reflect the look and feel of your site. This plugin makes it easier to customize these screens.
Movable Type versions: 4.3
Mark Carey has created over 30 plugins for Movable Type, which can be found on MT Hacks.