Found a cute little thread on Slashdot today. Guess which sites China is already censoring:

Step #1: Visit www.baidu.com.
Step #2: Search for Google or blogspot.com. Note that both work.
Step #3: Now search for google.blogspot.com.
Step #4: Enjoy your Baidu lockout. You should be able to search again in 5-10 minutes, I haven’t timed the duration exactly.

User Antiocheian says:

Same for googleblog.blogspot.com

Probable reason: “At the time we made clear that "we will carefully monitor conditions in China, including new laws and other restrictions on our services. If we determine that we are unable to achieve the objectives outlined we will not hesitate to reconsider our approach to China."

Thanks to @andrewbadera for the tip on this.