Adrian posted on how you can add Bible content automatically:
For example, if I was to write John 3:16 or 1 Corinthians 1:1-3, a script now creates those neat pop-up windows. There is nothing to install as such, just a few lines of code to add to your template, or if you are using WordPress, as I think I would like to do soon, then you can install a plug-in and customize it. Apparently you can even change the look to match your site.
Pop over to Reftagger and you can get the whole thing set up in about five minutes or so.