I also feel your pain -- sometimes I wonder why I even pick up a camera. When I look at my older negatives they seem better to me than what I am currently creating -- more varied and interesting compositions, better capture of light, better development, etc. Of course there were some mistakes, but I seem not to have improved on those either. In the past when I got into a bit of funk I usually tried something new -- a new camera, new film, whatever, just to spark my creativity once again. And now I've got too much stuff! Maybe Thomas is right -- simplifying things and having a real focus on what one wants to achieve is a way to push forward.