Yet another reason why Turkey must not, under any circumstances be allowed to join the EU (there are many many more serious examples besides a single website, but this just helps to illustrate a general trend in that country): banning YouTube at the country level. While I have absolutely nothing against the country, until it can grow up and understand why freedom of speech is important, everything that can be (legally) done to stop them joining the EU, should and must be done.
Yes, other countries in Europe block websites and make certain online activities illegal, however actions such as those regularly taken by Turkey seem to go well beyond what Europeans would consider to be acceptable. As a European myself, I find the kinds of values being asserted in their actions are diametrically opposed to those that Europe should hold dear. Of course, I might be wrong. Maybe Europe would be best served by compromising on various fundamental principles just to get another member state.
Jon.