ESLvideo.com

This site primarily seems to use YouTube videos, the quality of which, obviously, vary greatly. They seem to have been graded, but it's not clear how the grading works or how accurate it is. The exercises are also mostly of dubious value. Overall, if you find something useful, that's great, but perhaps the best part of this is the ability to make your own exercises. It requires a login, but the account is free.