I also installed Twonky, but movie playback on my Bravia is still a no-go.
This could partly be attributed to the fact, that my whole library is in the iTunes-y AVC/.mp4 format.
Twonky pretends to TV that this is a MPEG2 movie, and even starts to play, but no picture or sound.
DNS-325 doesn't have the horsepower for on-the-fly media transcoding anyway.