I've just heard that China now has over 221 million users online, slightly more than the USA, making China the largest single online market...
The complicating factor of course is that access to all sites by Chinese users is limited by the state.
However now, more than ever before, is the time to think about translating content (probably your key messages only at this stage) into simplified Chinese. In the next few days I'll be posting some more key steps that I think you'll need to action in order to ensure that this market sees your messages.