Botnets are old-fashioned – P2P networks are behind of massive DDoS attacks
The new trend in organizing Distributed Denial of Service attacks are P2P networks.
This is the way how Netcraft describes the situation:
large numbers of client computers running P2P software are tricked into requesting a file from the intended target of the DDoS, allowing the attacker to use the P2P network to overwhelm the target site with traffic.
The Netcraft entry points to FL-based Prolexic Technologies alert too sharing more technical details and information about the number of clients and the traffic being generated.
A very nice catch, Rich Miller of Netcraft!