The flash cs3 encoder is the same as flash 8 pro as far as I
I think there is the added feature of a de-interlacing option
which in my experience is not so great. I de-interlace first using
an external program and then use the flash encoder. The cs3
standalone encoder doesn't seem to do anything else more more
advanced than the flash 8 version ...eg. multipass variable bit
rate encoding...I wish it did.