One thing that helped me was additional vitamin D. I did some quick research and found out that one must be careful, as overdosing will bring back the same symptoms, but after adding an additional 1000 IUs a day, I am not getting as depressed as I used to.

Please note that my depression was minor, more of the "there is too much going on, I can't get started on anything, I don't feel like working, I think I will just browse something new on the net" day after day, sometimes for weeks at a time. Also, I am convinced everyone's system is different, so tread carefully and consult professional medical advice, where appropriate.

I also had recently (4 years ago) moved to way northern California, US, along the coast, so I get Oregon's type of weather (much more rain, overcast). Sun was no longer so prevalent, and very much may have had a bearing on this. YMMV.