I have the shift too. But on my 52" toshiba DLP I always have small black bars on the top and bottom when watching DVDS. Some of you said you have NO BARS at all? How can that be unless you are zooming the image or cropping it? 2.35:1 films are skinnier than a 16x9 screen?
Anyway, when I use component cables the bars are normal size. When I use HDMI input on either of the 3 resolutions the top bar is about 3/4" larger, so there is really no shift but the letter box is smaller because hte shrinks down from the top only about an extra 3/4" over component connections. This could be due to my tv overscan, but since others have reported this, I am starting to wonder. If you don't compare it to component inputs you will never notice it.