I think that most of us don't come anywhere near using the potential in our cameras, and that honing skills and craft is a much better investment than buying new gear
Here's a list of some camera features I'd love to have – all of them doable in firmware, so it's basically a free-for-all smorgasbord of ideas for camera manufacturers.
Yes I stopped looking frantically at the LCD on the back of my digital cameras after each and every shot. And I think it has made me take better pictures.
