http://www.youtube.com/my_speed
http://youtube-global.blogspot.com/2010/02/speed-matters-introducing-youtube-video.html
http://4.bp.blogspot.com/_EiL2QbQDRok/S3RFVRbi15I/AAAAAAAAAA4/XLqYga6_AE0/s1600-h/videospeed3.jpg

<<So, what can you do with all of this new data about your video speed? Well, that's entirely up to you. Some users will find it interesting to compare their city's average YouTube speed with the rest of the world's. Some will discover they're running at slower speeds compared to other users with the same ISP. A higher YouTube video speed translates to a better and faster experience not just for YouTube videos but for the Web in general; and by making this speed data available to users we would like to continue our ongoing efforts to make the web faster.>>