I think composition is the most important one. Almost anything else can be fixed in post processing with a good, diverse program like Photoshop. However, if your composition is off, there are only a few ways to help fix that and if you have composed it to cut off part of a scene that would have made the composition better in post processing through cropping etc. then you're pretty much hooped.
Post processing is great, but if the picture is not 'good' to begin with there's only so much Photoshop et al can do to save it.
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Nikon D40x | Nikkor 18-55mm f/3.5-5.6 | Nikkor 55-200mm f/4-5.6G | Nikon 50mm f/1.8D | Adobe Photoshop CS3 | Adobe Photoshop CS5
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