internet - Tightening the net

As regular readers might have noticed, I routinely make fun about the multitude of 'crackdowns' in China that hit the foreign media on a regular basis. Some new information has made me a bit careful, although, well, calling it a crackdown would most certainly be too much for me.
A few more websites have closed down, various media have reported.
Most important would be the - as it looks temporarily - closure of the Yannan-forum. That BBS has been instrumental for many important discussions and exchanges in the past. The jargon they use sounds very much like that used during the temporary closure of the weblog providers early last year, when local authorities ordered them basically to behave. So, the operators seems to have closed down their operation 'on request' as long as they cannot guarantee the authorities they can manage the BBS according to the government's ideas.
Troublesome enough.
I also go some information from media-related people who had trouble in renewing their visas for China. They still got the visa, after they promised not to give any lectures or otherwise engage in educational activities. Again a sign that not all is well.