Want to save your favorite YouTube videos? Just by changing the URL of the posted video to 3outube.com instead of YouTube.com will give you the chance to save the YouTube video as a mp4 or a flv file type. That is all there is to it, you can do this to any YouTube video you want to download, just click on the YouTube logo in the lower-right corner of the clip to get to the main page, then change the Y in YouTube.com to 3.