YouTube is a great site, period. If you're ever bored, or are looking for something in particular (such as music, tutorials or news), YouTube most likely has it. There are some videos that are unsuitable for children, however, so if you let your kids browse YouTube, be warned.
Excellent site for information and entertainment. Besides musical video, I often go to YouTube for "how to" videos. It is also a great venue for product information. I went to YouTube when I was researching cell phones.