For people who want to extract the most out of YouTube videos...
Try these Chrome extensions...
Video Speed Controller
Massively useful with the keyboard shortcuts S, D, and R.
Ratings Preview
Massively useful for avoiding junk videos. Hover your pointer over the ratings preview bar and you will see the number of reviews used for the rating. Sometimes even highly rated videos technically suck (many people rate advice/instruction before they prove it) but the rating is usually right.
YouTube(TM) Mouse Controls
A bit clunky. Can be used for controlling the volume with the mouse scroll wheel.
HD for YouTube
Just sets the default video resolution, I use low 360 so that I can get on with finding what I need. It can be raised.
Don't forget Stylebot! Not for videos, for everything. I used it to remove the large timestamp from the video preview window in the storyboard/timebar. Now I can see more in that video preview pop-up window.
Anybody else have other tips for playing YouTube videos in chrome, feel free.