FWIW, I sold two pics to a co-worker today. I think these are my first official photo specific sales (I sold some photos in conjunction with a magazine article I wrote back in the summer). Nothing spectacular, but made a nice profit over the printing costs. Yeah me!
They were a couple of poster sized prints that I had lying around the house. I had printed them for my own use, but never got around to hanging them up at our new place. We had a charity silent auction at our office on Monday, where I donated one of them and a frame (and a few other prints). The winner of the auction got their pick of one of the 4 I had on display. After it was over, my boss approached me and asked me if I'd consider selling a couple of the others.