The usability of YouTube

Jawed Karim, one of YouTube's founders, gives a lecture on how you tube got started The guys at 37 signals give their slant on the story and you tubes usability here "The external video player did have an amazing impact. In a matter of months, YouTube seemed to go from nowhere to everywhere due to that slick and easy to embed player. A big reason why the external player was so effective: Play buttons are seductive. When people see one, they instantly know what it does and want to click it."