I would add that sometimes when watching a 4:3 picture
broadcast in 16:9 on my 4:3 set set up for letterbox, that
the right hand edge of the screen appears slightly wavy at
times, the left hand side is fairly straight.

Just to clarify what I mean, I am seeing a small 4:3 picture
which has black bars top bottom left and right due to the wonders
of widescreen technology :O)

The right hand side can appear very wavy, I am unsure if the problem is
with my TV.