Brasil Telecom, a popular ISP in Brazil has already banned user access to youtube.com. As far as I know all other ISPs are still normal.

I, as a journalist, have tried to reach Brasil Telecom without any success. The only way I got to talk to them was through customer support, and they told me that the problem was with the company that authenticates my login. That sounds stupid. I have interviewed people from all around Brazil using BrT and none of them could access YouTube, except with a foreign proxy.

Here's a story about how ADSL users from BrT are now prevented from accessing YouTube. BrasilTelecom is one of the major phone companies and bandwidth providers, and they just blocked YouTube, without a single word for the customers.