Yahoo supplies information that gets Chinese journalist jailed
Wednesday, April 18th, 2007
I was driving home just now and heard a piece of this story on All Things Considered. I looked around on the web and found little trace of it. Amazing.
The media watchdog [Reporters Without Borders] accused Yahoo of becoming a “police informant” in order to further its business ambitions [in China]. Developing story at BBC News.
If this turns out to be true I will be very upset with Yahoo and will start to move away from flickr, a company Yahoo owns.

I remember hearing about this story a while back. Unfortunately it is not the first time they have been accused of such actions.
Here is some more info for you:
http://www.rsf.org/article.php3?id_article=16402
Oh.. and I just found this whilst looking:
http://www.boingboing.net/2007/03/15/china_dissidents_wif.html
Scary stuff.
Ahh. Sorry.. on re-reading your post I see that you have probably already read the Reporters Without Borders article.
Jamie, no problem, glad to have the links included here. Thanks.