It's the nomenclature that is used in the Greene and Russo guide. I think that DA stands for Doug's Area. I stuck with the same names to make sure that there was as little confusion as possible for people using the guide.
I figured there was a reason... Just couldn't figure it out on my own. Maybe the problems on the Mental Block should be listed as MB? I guess it doesn't matter since there are only a couple...
Climbs that are already published should probably be listed as their published names. That said, I think that everything else should be given a real name. Who wants to have climbed "Unnamed DA #43" when they could have climbed "Blood Sport" or "See Spot Run"? Slap a name on it and if someone wants to come forward with prior FA information then the site can be updated by an administrator.