Any chance you have a neat freak friend? I really enjoy cleaning and organizing... especially other people's homes for some reason. I have helped a few friends out who were feeling stuck, and it was win-win. I got to do something that brings me up and bit, and they got help with their home.

If you don't, I think there are some great suggestions in here... especially the 15-minute timer. Sometimes when I very depressed and can't bring myself to clean I do that, and often I end up doing more than I thought.