At a recent Harvard conference on bloggers and the media, the most pungent statement came from cyberspace. Rebecca MacKinnon, writing about the conference as it happened, got a response on the "comments" space of her blog from someone concerned that if the voices of bloggers overwhelm those of traditional media, "we will throw out some of the best ... journalism of the 21st century." The comment was from Keith Jenkins, an African-American blogger who is also an editor at The Washington Post Magazine [a sister publication of NEWSWEEK]. "It has taken 'mainstream media' a very long time to get to...