Alex has given you the 'rule of thumb' for shutter speeds to ensure minimum camera shake. The other thing is to stand in a stable position with feet about shoulder width apart one leg a little in front of the other and slightly side on, the left hand (assuming you are right handed) has the elbow tucked into the body for support with the hand supporting the lens at the balance point from underneath. The camera is pressed up to the head for more support with the right arm again in tight against the body and the right hand holds the camera. Then squeeze the shutter, don't jab it. Pretend it is a rifle and you are a marksman at long range, use breath control as well if necessary. By the way you don't have to necessarily shoot landscapes with a wide angle lens, I often use a telephoto zoom to pick out parts of the landscape. Do not be afraid with a DSLR to up the ISO a bit, say ISO 400 or even 800, to give you the required shutter speed and aperture for sharp shots with the DOF you want as there will be little noise at that sort of ISO.
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