I am a part of Seligman's Postive Psychology research. What I found so far from my part is that giving praise to another helps me.

It is not a conscious feeling better because I know I praised/gave support to another, it was that I realized, "Hey, my depression lightened even ever so slightly since the other day."

My project is to, as often as I am able, recognize good things that happen. Then, once acknowledging it, go a step further and tell others or show others etc, capitalizing on it. I have done this a bit with members here at PC, when I read a post about an engagement, or job or whatever, I post on that thread and then I also go to kudoes and begin a thread of congrats or whatever.

I am eager to find out if others also participating in this research find the same thing!