The GRavatar plugin works out of the mu-plugins directory and allows each blog user to enable it on his\her blog via the backend (under the presentation menu) we don't want to force things on our users, do we? There are reports that the GRavatar service slows down page loads so we will be adding a caching option to the plugin. This plugin can work just the same on a regular WordPress install in the plugins directory. Please note that this plugin uses the gravatar.com service and not local avatars. Developed by Hannit Cohen and Elad Salomons.