You have mentioned in your forum post that the highlights keep flashing. Nikon's are very sensitive to this, so please turn it off and use the histogram instead, especially if you are going to start shooting RAW (NEF). You can feather the leap to raw by shooting NEF+Jpg fine for a while, giving you both options.
Check the histogram and adjust the exposure with +/- ev or shoot a bracket burst. (Using the +/- ev button on the back of the camera and turning the control wheel a click or two either way will soon become second nature and you don't need to take your eye from the camera while doing it.)
Also, try changing the metering from average to spot or centre weighted (can't remember how the D80 does this) and see the differences. (The spot will meter from the focus point)
This way you will find a method of exposing (your landscapes
) that suits you and you are happy with. Don't be afraid to experiment with the settings, but turn off or ignore the warnings!