A Gravatar (Globally Recognised Avartar) is an avatar that follows you from site to site indentifying your contributions to multiple sites. When you post a blog entry, comment on another blog, post in a forum your Gravatar will appear identifying you across all these sites. This plugin integrates gravatars into PostNuke.
Gravatars are a free service offered by http://www.gravatar.com/. To aquire a Gravatar a user signs up with gravatar.com and uploads a suitable 80x80 image. The users e-mail registered with the PostNuke site and gravatar.com is used to tie the user to thier Gravatar.