Ok thanks for the info. I am finally going HD this month and have been going back and forth between the Sony 34" XBR CRT and the Sony 42" Rear Projection LCD. I was shocked at how distracting the grey Window box bars were on the RPLCDs when viewing SD programs. I think (based on years of ignoring black letterbox bars on a 4:3) that I can live with SD window boxing better if the bars are black.
PS. I'm new to site, but thankful for the weath of info here.