After a week hiatus, Youtube, a Google-owned video sharing network, is back online.
It seems that tonight(Mar 22) Chinese users could visit YouTube again since it was blocked on Mar 15. I can confirm China Telecom can access it. It was really terrible when YouTube was blocked a week ago. There is no official answer as to why Youtube was blocked for a week period by the Chinese internet regulators. Quite a lot of people considered that it was for the tibet riot on Mar 14.
It may be that Chinese authorities has brought the situation under control, and Kuo Min Tang win the Taiwan Election too, so they unblocked youtube, but some of the special video in Youtube still can not access. The Chinese authorities constantly prevents access to sites that it finds content or ideas offensive. Chinese users should enjoy Youtube while it's available because we may never know when it will disappear.