Create a separate mail account for the blog, possibly using a false name and address if required for registration. On the blog, I would be careful about what names I mention (I would probably create aliases for everything), and I would mention nothing personally identifiable. If you seriously need anonymity, as in people of authority might come looking for the owner, try using a proxy or two to hide the IP address of the blogger. Aside from that, if the government wants to find the owner, they likely can.. you’d have to be a computer whiz to find a way around publishing a blog in your country. I have an anonymous blog, myself, and no one has yet to figure out it’s me.