Personalize, if not humanize, your posts, adding (CSS) popups containings avatars next to mailto links, as well as next to any word. You can chose avatar images, or let Gravatar chose it for you.
For documentation and tips, please refer to the official plugin page for <a href="http://planetozh.com/blog/my-projects/wordpress-plugin-avatar-gravatar-popup/" title="Avatar Popup" rel="nofollow ugc">Avatar Popup</a>

Ozh' Avatar Popup

Add CSS popups next to mailto links or next to any word. Can be any custom image, and has gravatar support.

This plugin will list posts spammers find the most attractive.
It will help you identify on which forgotten post you should close comments, and also define potentially spam attractive keywords in your titles (eg. “comments”, “feedback”, “guestbook”…)
Read more: <a href="http://planetozh.com/blog/2010/09/spam-magnet-blog-posts/" title="Spam Magnet Blog Posts" rel="nofollow ugc">Plugin’s page</a>

Ozh' Spam Magnet Checker

Identify posts spammers find the most attractive.

Ozh' Avatar Popup vs Ozh' Spam Magnet Checker