flash (macromedia):
this all depends on the content. If you are using images it is never going to
look as good as a photoshop resize, flash player has to be easily downloadable
and cant contain complex image display code. Like any other web language, you
are best served to create and use images the size you want people to see them.
You can set the amount of smoothing flash applies to an image, but I believe
the default is set to high anyway so you could only make it look worse and that
aint good...
Take it easy