Hello,
as we have a big number of modules and we did updates like renaming, merging, ..., I have created a dokuwiki page to track a module.
Now it is a table that should show for each module the date (release) when it was introduced, current status and description about that. Feel free to enhance the format, the page is located at:
http://www.kamailio.org/dokuwiki/doku.php/modules:status
Now it is just a skeleton. I hope all of you will contribute there. You can add to description anything you believe is relevant for that module.
Cheers, Daniel