Stumbled across a link to this on another site and thought it might be of interest to the massive.

20 videos of individual musical performances on a page, which can be started at various intervals or all together - as many or as few as you choose - and they all make sense together musically. You can even change the respective volumes of the videos to alter the mix.

You can check it out at http://inbflat.net/

I wonder if this is how Radiohead come up with some of their ideas...