Hmm... I use M mode most of the time. I change to the Av only when I want to do some exposure bracketing shots for a HDR - Av mode is - I belivie - the only one suitable for the HDRs becouse it doesn't change the aperture when shooting a series of photos so the DOF stays the same.
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Pentax k10d with 18-55/3.5-5.6
My flickr
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