oh, i'm not wondering why youtube broke into the top 50 sites. the concept of having an online tube is like having a ready tv set in front of you, only you're not limited by the time slots in every channel. you get to choose what video, commercial, or even movie clips to watch. some even download whole films by chopping them. i have also found youtube as a great way to share videos with my relatives abroad. it's free and convenient yet i wish i could upload more than 100 MB. :)