Bill Bishop's blog/newsletter Sinocism has become an absolute must-read for anyone wanting to keep up with these interesting times in China. I suggest going to his blog here and signing up for the daily email via Feed Burner. The daily email makes sure you get every post he makes.
Bishop (aka. niubi on Twitter) is a fluent Mandarin speaking American who's lived in Beijing for years. He's an entrepreneur who co-founded CBS' Marketwatch. It's obvious from his work that he spends a great deal of time these days working on Sinocism.
Sinocism has been an excellent guide for the many recent controversies in China - Bo Xilai, Chen Guangchen, and the recent crackdowns on foreigners among others. His commentary and news curation is extremely wide-ranging, but I find his writing on China's economy and internet to be most enlightening.
There's no blog, Twitter feed, or news website out there better than Sinocism when it comes to China news and commentary.