I know there are a lot of them on Youtube, but most don't actually mesh that well or sound good after mashing it together. I hope in this thread we get some videos that are greater than the sum its parts. Example: <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/uOzeB3Wz8D8&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/uOzeB3Wz8D8&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/__3McxusO7Y&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/__3McxusO7Y&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/BFJmk4jD4Vo&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/BFJmk4jD4Vo&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/AKODnXoDmpE&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/AKODnXoDmpE&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object> Not sure what you mean by "video" mashup. But the above is one of my all time fave mixes. 'Just an excuse for me to post it.