The Bibleref plugin will search your posts for any Scripture references and will wrap them in <cite> tags with the intent that this will make it easier for web search engines to find Scripture references being discussed in your blog.

This kind of modification is called microformatting. A discussion on Scripture reference microformatting can be found at The Semantic Bible.

At this time, the plugin will only look for references not already wrapped in tags. If you manually link your Bible passages to something like the Bible gateway, the plugin will not cite those references. In the future I will consider modifying the plugin to automatically handle references within links.

Download and get more information at the Bibleref plugin page.