Reporters Without Borders have a handbook downloadable or viewable on their website on blogging aimed at political dissidents and the like, offering advice on staying anonymous along with the usual stuff:
Blogs get people excited. Or else they disturb and worry them. Some people distrust them. Others see them as the vanguard of a new information revolution. Because they allow and encourage ordinary people to speak up, they’re tremendous tools of freedom of expression.
Bloggers are often the only real journalists in countries where the mainstream media is censored or under pressure. Only they provide independent news, at the risk of displeasing the government and sometimes courting arrest.
Reporters Without Borders has produced this handbook to help them, with handy tips and technical advice on how to to remain anonymous and to get round censorship, by choosing the most suitable method for each situation. It also explains how to set up and make the most of a blog, to publicise it (getting it picked up efficiently by search-engines) and to establish its credibility through observing basic ethical and journalistic principles.