I grabbed my wife's iPhone 4s and was going to see if I has processed all the photos she had taken in the past month or so. To my astonishment she only had 20 photos in her photostream, and the same 20 photos in her camera roll. I know there should have been many more photos than 20 from the past month!
She seems to be under the impression that she needs to clean up her camera roll AND photostream. Isn't it accurate to say that photostream has limits as to the number of photos you can maintain, and you don't have to worry about cleaning up your photostream?
How about your camera roll? Do you periodically delete photos stored there as well?