Basically once the user is done typing a title or removes focus from the title box, it will search the DB for similar threads through an AJAX request. If threads are found, it will display the results above the title input box so use can participate in the similar threads instead of creating a new thread about a similar topic.
Definitely a feature I would like to see, since a number of members refuse to search first or just simply look at whats going on, lol.
If this is already posted, sorry. I did search! Or if someone is making this mod, hook me up with the info/link!