It matters if you want to print them. It also matters if you are going to do any post work on it. With that said, it's fairly doubtful that anyone needs more than a 10-12 mega-pixel camera. I find a 10 mega-pixel camera with a decent flash and a good lens to be more important than a higher mega-pixel camera. A lens can make a HUGE difference in image quality, as can the quality of the camera's CCD.
