From CNet News (link):
Yahoo may have helped Chinese police identify an Internet writer who was subsequently jailed for four years for subversion in the third such case, an advocacy group for journalists said Wednesday.
News implicating Yahoo in the imprisonment of Jiang Lijun in 2003 surfaced on the eve of a summit between Chinese President Hu Jintao and President Bush in Washington.
It was the third such case involving the U.S. Internet giant.
See also “Fighting Yahoo’s China Policies” from RSF. RSF’s statement on Jiang Lijun’s case is here.