I've discovered another Chinese-language Twitter site called "Weico". This site seems a bit different from the existing few, but it still follows the Twitter model. It operates through QQ, MSN, Gtalk, text messages, and WAP. The difference is that it has an added reply function, which seems more suitable for the usage habits of domestic internet users. Moreover, Weico doesn't thoughtlessly copy Twitter's "what are you doing" like some other similar sites. Weico claims to "record every moment of life" through QQ, MSN, Gtalk, and mobile phones, which looks pretty good. The user experience is also quite well done, with its own unique style.
My Weico record: http://vikooo.com/weber