I do not know of a Chinese blogger who has gone to jail, but I know several who have had their blogs shut down. I also know some Chinese bloggers who have received threatening phone calls from police warning them to 'be careful.' In some cases, they stopped blogging for a while.

~Rebecca MacKinnon

I haven't heard of any cases of anti-American blog posts being censored or bloggers encountering consequences for anti-American speech on the web in China.