It really depends on your style. Do you want the ultra wide angle photos that are popular now or something more like ansel adams? Or something else completely? Personally I have shot landscapes with everything from 10mm to 200mm. it really just depends on the situation at hand.
Somethings that I would say that every landscape photographer should have however is a good tripod, filter holder system, ND filters and ND grad filters, polarizing filter, a cable release. I also like the blue and gold filter but that is a personal taste thing.
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Rex K
The view from my "office" doesn't suck. 
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