Kk, going back to the main topic!
I'm gonna go against the grain and say that I actually prefer having people in my landscapes and urbanscapes. I find it adds a different depth to the image if it was just the landscape.
When I do have them in, I kind of make it so they're a part of the scene but not the subject. Usually I don't shoot faces, which I think distracts viewers as people focus on faces. Part of my tactic is in keeping the person small relative to the image so that they're like a portion of the landscape shot.
Here's one of mine: http://www.flickr.com/photos/dugrant/4896540485/