Discovered Operation Payback. A internet activist group. Recently, they launched attack on those who attacked Wikileak. (See: Wikileak: US Diplomatic Cables Leak.) They DDOS attacked sites of Visa, MasterandCard, Paypal, Amazon, and some government sites. In the past, they've attacked sites such as Recording Industry Association of America (RIAA), Motion Picture Association of America (MPAA), Warner Brothers, and also Scientology, etc. Typically, big organizations that cracks down on piracy networks. (See: Scientology and Falun Gong)
I don't support software piracy. (See: Pirate Bay, Open Source, Free Software, Copyright.) However, in this world, much of it is political struggle. For example, there are 2 politicians B and E. You don't really like B, but you think E is by far the most evil. B is your possible chance to prevent E becoming more powerful. So, in many circumstances, you have to support B. This is in fact how alliances work.
Also, orgs like the Operation Payback are made of individuals, like you and me, where each of us make decisions individually, as opposed to big organizations that are typically mindless power controlled by a few. In some sense, that's a essential ingredient to keep some power to people, a form of Grassroots movement.
Also, i've always wondered how those DDOS attack gets their machines. I thought it's from viruses (trojan horses), whic got to people's machines from games or pirated software downloads, without user being aware. Today, i learned the answer. There's this tool LOIC (for Low Orbit Ion Cannon). Basically, it's a software application you can download, so that you can participate in a coordinated attack against big sites. (the “attack” basically just means visiting the site repeatedly to drive their server out of handling request capacity; this is knows as DDOS (Distributed Denial Of Service) attack) Of course, some DDOS attack are from rogue software (viruses; trojan horses) that hijacks user's machine without user knowning. But LOIC is the proper tool to carry out people's voices, in a meaningful and controlled way.