In a prior article, I showed you the mechanics of focus and how to go about using it in your outdoor photography. In this video, I walk through some pictures to show you how I put those techniques to work in my own photos. Hopefully this gives you some ideas on where to focus in your own pictures.
Before viewing, check out this article: Nailing the Focus in Outdoor Photography
If you are not already pretty solid on the concepts of aperture, depth of field, and diffraction, you might want to check out the articles at those links as well.