I think you’d be hard pressed to find a single human being who isn’t aware of YouTube on at least some level. As more or less the most popular video streaming site on the ‘net, it’s spawned a wide array of copycats and poor imitations. At the same time, it’s caused the birth of a number of rather excellent addons, features, and tools.
YouTube Doubler: Make Video Mashups: If you’ve ever thought that two songs would go perfectly with one another, or you want to combine a song and video, but can’t be bothered to sync them up on YouTube in order to test that theory, this one’s for you. Granted, it’s not absolutely perfect. I’ve noticed occasional start up lag on one or two of the videos but it’s better than having to do everything yourself.
Yooouuutuuube: Youtube Mosaics: With the right video, this one’s positively psychedelic. I’m sort of at a loss as to how to explain what Yooouuutuuube is and what it does. Basically, it creates a ‘mosaic’ of a YouTube video. Each square in the mosaic starts a short time before or after the squares on either side of it. There are a number of other visual effects that can be applied to it, as well. It’s actually very relaxing to watch.
HTML5 Trial: Speed Up and Slow Down Videos: With the experimental HTML5 feature on YouTube, you gain access to a ‘speed’ option on most of the newer videos. You can either increase the speed by half, double it, cut it by half, or cut it by 3/4. It’s safe to say this one’s still heavily in beta. A lot of videos experience some pretty major distortion if you change the speed and some don’t work at all on the slowest. Still, it’s a pretty neat little feature and hopefully it gets a bit more polished once they’ve brought it out of beta.

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Your YouTube Doubler link points to the HTML5 page.
Fixed. Not sure how that happened.