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A little bit back Funimation
explained on their forums about their step-by-step process of bringing DBZ to HD quality DVD boxsets, including the controversial act of turning the series into widecreen format. They did a good job then about explaining why changing it to widescreen was a good idea, but now they've provided an actual video to give viewers comparison shots. Very informative & interesting. Check out the high-quality download of the video here:
http://media.funimation.com/trailers/DBZ/dbz_tech_Large.mov