I just keep a spare Nikon cover. The are really inexpensive. I have tried the stick on protectors, but in my opinion, I find they make the screen not as distinct. I also don't feel they protect from any impact. So I just get a new protector from B&H every few months or so when I order something else.
You will probably encounter lots of differing opinions on this, so I would think more a matter of personal taste. Try different solutions and see which one works for you.
I use the Giottos LCD protectors, which are made of fine glass. They are a bit more expensive, but they are thin, make the camera look great and do not interfere with the image quality of the LCD. I used one on my D200, and then got one for my D300.
Sun 13-May-12 07:21 PM | edited Sun 13-May-12 07:24 PM by Nikon300Bob
I use the ZAGG invisible shields. They are on the LCD screen and the control panel screen. These screens are guaranteed to protect your screens and will do not impair your view. It is near impossible to scratch your screen once they are installed. There are individual kits for every Nikon camera ... mine is for the D300. If you are nervous about installing them there are kiosks in many malls in Canada and the United States where for a small charge someone will install yours perfectly. I also use their shield on my iPod Touch. The product was developed for the military to protect the front of helicopter blades.