well I have both phones and I have to say that they are more similar than most people think. in my opinion, the W600 would be the perfect phone, in all aspects, if Sony had just put an expansion card slot on it. how they can pass it off as a walkman/multimedia phone, but not have extra memory is completely puzzling to me. that being said, the T809 obviously has an advantage there. everything else between the two, feature-wise, is up in the air. the audio on the W600 is superb, but I think the video/camera/screen capabilities of the T809 are slightly better. they actually say the screen on the T809 is like a plasma TV screen for a phone; I don't know if I would go quite that far but it is definitely the best screen I have personally experienced. in the end, I think the T809 has the edge(no pun intended).