According to this story, one of the factors which led to the deterioration of the case against the Duke University lacrosse players was the persistence of Robert D. Johnson, a history professor from Brooklyn College.
Soon after the case began he began a blog (Durham-in-Wonderland) which he used to explore questions he developed concerning the merits of the case. His discoveries apparently guided the defendant's lawyers as they developed their defense.
Should we expect more of the same? Can weblog be effective tools for private citizens to bring attention to criminal cases they find problematic?