In the US especially, the power of blogs continues to increase. The defeat of a former VP candidate in his own party’s primary is largely credited to blogs and online activism. That’s a huge scalp, with Daily Kos claiming some credit.
And on the right, look at Little Green Footballs. Charles Johnson is hated by many on the left, but the LA Weekly summarises:
Johnson caught Dan Rather trying to swing a presidential election, and now he’s blown a giant hole in the credibility of the world’s largest news service. As a result of his work, Reuters has been forced to delete all 920 Hajj photographs from its database, tighten its filing drills and institute a new policy whereby all Middle East photographs will be checked by the editor-in-charge on the Global Pictures Desk before release. Johnson achieved all this in, oh, about 48 hours.