Banning websites for some reasons is meaningless because people may need those websites for some other reasons and it is useless as they always find a way to use them just like they use youtube and myspace.
Governments are banning certain websites in order to protest them for something or as they think those websites are harmful. But banning them has no point for most of the time, I think. Take youtube for example. It is forbidden in our country for political reasons -because there are some videos that are libellous to Atatürk- but banning it didn't make any difference, people kept uploading such videos and it is still available with little tricks in our country. All I'm trying to say is that by trying to make people unable to access some sites by force, making them be aware of the consequences of entering those websites would be more reasonable.