Hi Roy, I have similar findings with the 30D, I also am tending to dial in + 1/3 - 2/3 EV, this camera behaves differently to my previous Nikons. Going by the Histogram on the 30D when set to 0 EV the peak is mostly to the left so this is what I go buy to evaluate if I need to ad EV which most of the time do. I have noticed looking a lot of 30D pics on galleries do look underexposed by 1/3 - 2/3 when EV is set to 0.
pic below + 1/3 EV.
http://www.worldphotographyforum.com...500&ppuser=146
Cheers