Josh, It's interesting to me that you reply to Martha's email today.
We recently started using nginx proxy on the brick heads with ldirectord running on our load balancers. We've had issues where ldirectord dies about one per week on each load balancer. It appears that the load balancer is running out of memory. I've mentioned this in IRC a couple of times but gotten no responses from anyone. I am going to look at alternatives, and I'm leaning toward setting up haproxy on the load balancers. Jason