I know that HD is better looking than SD. I have an HV20, too. But youtube videos are small. And on youtube, SD footage with a good 3 ccd camcorder can look comparable to HD footage. It doesn't matter how much you can squeeze onto youtube. There is plenty of footage out there taken by standard definition camcorders that look spectacular. When it comes to youtube, it's not really about SD or HD. It seems to be more about how nice you can make the colors look and, of course, the content.