The wonderful Allie (who blogs at Hyperbole and a Half) has recently updated her blog with an account of her battle with depression. She tackles the subject in her own special fashion illustrating the experience with a unique drawing style.
We have - fortunately - advanced in our acknowledgement of depression. It's regarded less as a stigma to be hidden and more as it should be - an illness that can be treated.
Given how common depression is among writers (I googled the topic and was quite shocked at just how many well known authors have suffered from this debilitating illness) perhaps this is something we should all think about. We might not be sufferers ourselves but the chances are we know someone who is so it pays to be aware.