youtubedoubler.com/

nice site , play 2 Utube video side-by side, so you can mash up video .

you can set delay to videos to better syncro them

youtubedoubler.com/?video1=you ...

DPic

Hah! Nice combination!

=]

Not sure who came up with it but i got it via Reddit reddit.com/r/reddit.com/commen ...