Doctor M said:
BUT all things being equal, more lines of resolution is always better, and only a one-eyed idiot (with the good eye swelled shut) can't tell that HD looks better than SD no matter what size the screen.
To this I say: 12". :P
There are a lot of factors in what makes HD look better than SD, as has been covered before. Only when all factors come into alignment is there a notable difference.
This still doesn't change the fact that BluRay is a waste of precious money ;)