Spirit of America, set up by a government think tank with oil money, has launched a "blog safer" wiki on how to blog anonymosly. They call it 5 initial guides on how to blog more safely. more
Usually ethics in the blogosphere would require people to declare who they are and what their interests are, but in places where there are repressive regimes, this can be very dangerous. So in a spirit of disobedience as a civic duty, in order to help society evolve, it is acceptable to blog anonymously.