Eyetoy 2.0 can take HD resolutions to the highest quality... and not only can Eyetoy 2.0 detect depth it can also detect when you're happy or sad, Eyetoy 2.0 can detect when the turkey is done in the oven, or when you sister is pregnant.
Eyetoy 2.0 is all seeing & all knowing. With the power of cell behing the Eyetoy 2.0, there is nothing that Eyetoy 2.0 cannot do.
*starts chanting
All hail Eyetoy
Long live Eyetoy
All hail Eyetoy
Long live Eyetoy
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but seriously, supposedly* eyetoy is an HD camera and is accurate to the pixel. Its execution of getting the user involved to control or interact with imagery on the screen is ultimately different, but can have very similar results. Many interesting things will be possible with eyetoy, but the DPD is specifically designed to do most things the eyetoy can do (except put the user on the screen) and do it with absolute precision and minimal physical interactivity.
One of the many problems with eyetoy(in comparison to the DPD) is that you need something that is slightly reflective that the camera can track and hold it in you hand, and if you want to percieve depth, you will need a second camera. Also the eyetoy is essentially a peripheral and will be lucky to tbe utilised in 5% of games made for the system in any sort of intuitive way.
*this is the key word, everthing after the asterix should be taken at face value and not as fact. It is all based on Sony marketing talk and internet heresay