naraht points to posts by charmian and gehayi that cite Russian language news releases from SUP (LJ's parent company) that describe "a DDoS so strong that the backbone providers (Qwest and Verizon) couldn't stand the load, with an avg. traffic load of 6 gigabytes."
A machine translation of a part of one of the releases says
"Separately, we note that the recipients are not popular DDoS bloggers, the attackers are attacking IP service, thus, an attack aimed at LiveJournal as a whole. As we have noted in previous attacks, we have installed high-efficiency equipment, after the attacks in March and April, we purchased and installed additional hardware, software and increased bandwidth, which helped to counter a much larger loads, but now the attackers have changed tactics and impact on supplier relations."
My interp of this is that apparently the attackers are no longer targeting specific bloggers - they are concentrating their attacks so as to cause disruption at the ISP level.