Let's speak if you are loooking for plugin that enables Gravatar hovercards, this is not the plugin right for you.
When you rollover click on avatar, tooltip popups and shows some additional links if the author is user e.g to user post archive, to user external website, to blog some info from Gravatar if author is registered to that service e.g location, about me description, websites, other account pages ..
Tooltip of user not registered to blog but registered to Gravatar.
Tooltip of user registered to blog but not registered to Gravatar...
Because the owner is registered neither to the blog to Gravatar...
You can use the sample available at this link the tooltips will show the user bio, link to recent posts, the links to social network profiles.
The following sample adds debug info at the bottom of tooltip my avatar tooltip content after { if ) { $text.=.
The following sample replaces the list with link to Gravatar full profile function my avatar tooltip content gravatar accounts { if ) { return.
If you are brave, the function that returns the text is pluggable and you can replace it at all create php file in mu-plugins folder add function called axe at tooltip content from that moment, the plugin will load your custom function...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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