Is there anny technical information on this ? i have some ideas as to how its done but it be nice to see what thay did.

It appears to be folding or blending frames vertically, from bottom to top, in a slow scan. Probably not a very complicated algorithm, but a very clever one.

Found on google:
http://livedocs.adobe.com/en_US/AfterEffects/8.0/help.html?content=WS3878526689cb91655866c1103a9d3c597-7a52.html

She is going to be the next liquid dancing world champion!

I'm almost certain that that piano part is taken straight from Chronotrigger. I'm just not sure which song.

slow scan magic for sure.. here is a picture of a garage door opening with a slowly scanning camera
http://www.sentex.net/~mwandel/tech/wacky_garage.jpg

It appears that all of the "data" for each frame of the sequence is still intact (there's a complete picture for each frame) - it's just being played back "earlier" toward the bottom. Wouldn't a slow-scan camera take a single time-displaced frame, like the one of the garage door?
I'm pretty sure the link KnivesOut posted is the likely explanation.

Anyone know the music to this?

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That's some mad break dancing! kidding!

Damn that's trippy.

Zbigniew Rybczyński (often called Zbig) actually used this technique to produce a film called The Fourth Dimension (1988). I guess it's the same technique used in this video, and the effect is really cool. You divide the image into lines, and delay each line a frame further. Each new frame advances one line. So by the time the last line of the first image comes in, the very first line is already a lot of time ahead. Very cool indeed!