For auto bracketing, I just do 1 step in the smallest increment in either direction. Also, I'm not sure if shooting in raw makes that totally obsolete or not - which I definitely recommend.
And yea, on my digi I shoot aperture priority almost exclusively and then use the + / - button to fine tune the exposure.
One thing to think about is that depending on the light, there can be more contrast across the frame than one exposure can hold and you are going to lose information in either the light or the dark areas or maybe both (ie will be black or white with no detail). Its mostly best to not shoot in that kind of light, unless you are trying to use it to produce a particular effect (like washed out with bright whites or something).
But if you have to shoot in bad light, I usually err a little on underexposed to try and salvage as much detail as possible in the light areas - which is almost always the sky, and tweak it in photoshop.
But mostly, light is king. If you want to do a lot of landscape stuff, I suggest scouting your spots ahead. Then when a day comes around with dramatic skies in the evening or early AM, bust your ass out there to get the photos.
I live in AZ where the light is fuckin terrible for about 22 hours a day... lol
