Since no one seemed to cover your on camera exposure compensation (what you would be using to bracket on the auto modes) I figured I'd hop in with that. On the D40 you have a little +/- button right below your shutter release button. This will change your exposure compensation. If you have it at default setting of zero and you take a picture and think that it is too dark or too bright you can adjust that simply by holding that button in and turning the little notched dial. It gives you alittle more control over your exposure in the auto modes and (hopefully) saves you the trouble of adjusting post exposure.
Hope that helps.
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