Beyond question, Youtube.com is the most popular video sharing website now. If you wanna get the latest and hottest videos, then youtube.com is the No.1 choice. What I always do in youtube.com is bookmarking all of video clips that impress me and view them more than once. However, Only Bookmark your favourite video is potentiallly dangerous, because these video could be deleted by authors or Youtube.com for some reason. So the best way is download these video clips from youtube.com and save into your PC, then it will never lost.