I don't know if all the coders know it, but, because of a WMCoolmon's request (http://www.hard-light.net/forums/index.php/topic,44892.0.html), I started a Wiki page which is intended mainly as a log for FSOpen engine updates:
FreeSpace Source Code Project > List of added capabilities Or SCP_Additions (http://www.hard-light.net/wiki/index.php/SCP_Additions)
But I've just looked at the editing history of that page and nobody has posted anything since my last update in early August. :( :(
Maybe there hasn't been any additions to the code but bug fixes, but I think that active coders are not keeping this page updated. Please, although it can be somehow a PITA, keep it updated or this list will be fully useless.
(Maybe this topic should become sticky)