A few days ago a friend of mine in Beijing started having problems with iTunes. He said that it kept on resetting for no apparent reason. Strange as it may seem, he even called me across the pond on Tuesday for technical support. I had no idea what was wrong so his friend went to the Apple Store in Beijing, and they told him that iTunes had been blocked in China as of Tuesday morning (August 19, 2008).
It turns out that iTunes was blocked for political reasons. According to the Sydney Morning Herald, Olympic athletes have been purchasing pro-Tibetan iTunes songs while in China. Obviously, China wasn't too impressed.