Here's several media blogs ie. blogs written by staff of media organisations, which all deal with injustice issues like corruption, hegemony and media bias.

From the Nation, the Daily Outrage which posts critiques on aspects of American politics and society.

Antiwar.com's blog deals with issues around the world including not just America but Iraq, Europe and elsewhere.

CSmonitor has several blogs, including these two where correspondents post on location from Africa and Iraq.