Apple has posted Installation Instructions for Developers, consisting of simple instructions to aid developers in sharing their Spotlight Plug-Ins, Dashboard Widgets and Automator Actions.
Automator Action Installer
The Automator section includes a downloadable application, Actions Installer, designed specifically to let developers package Actions as simple, one-click installers. It also includes instructions on how to add ReadMe’s, license agreements and other support documentation. While installing Actions is quite easy to do manually, providing an app-based means of installation is always welcome, and only adds to the simplicity of Automator.