Hi, Winnetou

This is Robert . I am a Chinese Canadian living in Montreal Quebec. I think I can answer some of your questions here ,

The answer is based on the situation of  Mainland China, excluding Taiwan or Hongkong.

 *   I would like to know how popular BitCoin is in China? Are there already some "real life" shops where you can pay by BitCoin?

There is a tiny tiny number of people who is aware of this ,there is no news about Bitcoin circulated on the major media controlled by the government ,as you know, 99.99% of Chinese populaton don't read English and there is Great Fire Wall preventing people getting in touch with the outside world .Let alone the real life shops.

As far as I know ,there are around 150 users on this forum who speak Chinese (data from the leaked MtGox email addresses).So ,it is safe to say it is very unpopular.

Once there are more news coming out in Chinese Media ,I don't know what will happen.

*    Are there any laws against secondary currencies like BitCoin or some official statements from the government?

There is now laws against now, however you won't be benefiting from it unless you have certain connections.
Under the existing economy structure , banks are strictly controlled ,  Bitcoin will soon be banned or manipulated by a government-controlled bank  once it became popular in Mainland China.



*Are there already some manufacturers out there who are accepting BitCoins?

Not at all! Although there are some traders sell on Taobao.com (Chinese version of Ebay , controlled partially by Yahoo!)

Hope this be of some help to you

Regards

Robert