3-D composition is a different animal than flat ... as a general rule, try for something near and far, yes, but not too near. The best stereo is 30-times the distance between the two lenses, which means about 10 feet away. So a shot of three people 8 10 and 15 feet away will show good stereo separation.
I've found that good stereo composition depends as much on the light as the placement -- good modeling light from the side makes any situation look better in 3-D. If you shoot people, line them up nearer-to-farther rather than all in a line flat ahead of you. Something off to the left 5 feet away, something in the middle 10 feet away, something else farther away further back, and so on. Try to avoid things coming into the frame from too close because they violate the 3-D window (what's that? Imagine looking out a window at the scene -- the window frame is what you are looking through at the edges of your 3-d picture.)
Water tends to look plastic and frozen in 3-D. Things really far awy don't make good 3-D all by themselves because there's so little difference between the left and right view that they end up flat, but if you have foreground stuff that helps. I shot the statue of liberty through some trees, for example.
You can find a number of examples, and links to other educational stuff, at Brian May's web site. The lead guitarist of Queen (Bohemian Rhapsody) is a huge fan of 3-D and has shot it for years. His web site has some good basic information as well as a lot of good examples.
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http://www.londonstereo.com
Some recent 3-D movies have been good. We saw "Ant Man" in 3-D and I thought they did a pretty good job.