Sunday evening [7th February 2010] Youtube.com  started facing intermittent reports of irregular inaccessibility across various ISP's  in Pakistan. It initially started off with a simple white page displaying the word “This Site is Restricted” throughout the Youtube domain which were reported widely on Herdict Web , roughly displaying that the site-wide inaccessibility lasted for about an hour but after that everything seemed to have been recovered back to normal.
Instead it was then reported that the Internet governing body Pakistan Telecommunication Authority, which monitors internet access from Pakistan has placed a URL-specific ban on one particular video  in which the President of Pakistan Mr. Asif Ali Zardari is seen to deliver a very forceful and curt “Shut-up” to some participant at the rally he was addressing a rally  barely a few weeks back.
It must be noted that Mr. Zardari actually says in Urdu
“What has happened to this democracy ……. Shut Up”
Many Pakistanis would find this as a hilarious coincidence coming from a infamous corrupt leader who has a quite a large number of corruption cases outstanding against him. In 2007, his wife Benazir Bhutto was assassinated after which Mr. Zardari successfully hijacked her party and nudged his way into the power corridors in Pakistan and land up in the Presidency. All this was only possible as he negotiated a compromise with the then President of Pakistan, General Pervaiz Musharraf by fabricating an illegal constitutional order [NRO – National Reconciliatory Ordinance] which pardoned him of all his corruption cases
Link to the Blocked Video – http://www.youtube.com/watch?v=hzuHD5x1fEU  [a few other variants have also been blocked]
Sources analyzing this recent censorship attempts suggest that the PTA engineers were yet again testing & fine tuning the URL-block list as they slowly nudged these videos inaccessible to Pakistani, this risky trial and error has been the hallmark of the very same PTA engineers who in February 2008 masterminded [accidentally] to knock out the entire youtube.com network as then PTA tried to block a certain election vote rigging video  ending up to misconfiguring the DNS records of Youtube resulting an serious outage world wide for a good few hours before youtube scrambled to fix the errors
Political analysts believe this recent run of censorship is more a knee-jerk reaction by the present rulers of the country as they are facing pressure from a number of areas, more specifically the previously side-lined corruption cases that they had in 2008 nudged away by some illegal constitutional reforms, to get themselves elected have been reopened for a detailed investigation by the Supreme Court of Pakistan which as done away with the various constitutional reforms bringing at stake their appointment to these high-level offices