So much of having a "good eye" is just knowing and being able to recognize what works for you, what you like, and this is really hard to do if you've never seen it. In addition to looking at "rules of composition," and practicing shooting from a variety of perspectives (both really good suggestions), also just go online and find examples of photography that seems really strong to you, that is striking, or looses the "flat" feel that jdepould mentioned.
For a long time I've kept a folder on my computer of images that I found really strong, and If i feel stuck, I just browse through them. Flickr's a really good resource for this. After your eye has seen and recognized enough images that suit your idea of "strong" composition, it'll start to recognize it as much through the viewfinder as it does in other people's shots. At least for me, the eye learns best by example.
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