Scotland Yard isn't investigating "Anonymous". They're investigating the people involved in the DDoS attacks. If you're a member of Anonymous but you don't participate in attacks, you're alright because nobody knows who you are, or that you're even a member of Anonymous. However, the minute you start attacking, you are immediately identifiable. "lulz yeah but we r anonymus. we r legionz!!!1 omg for the first time in my life i can actually identify with something. cool! are there any lonely girls here???/" Protip: When you're on the internet, you are NOT anonymous. Most of Anonymous is just a bunch of teen-angst lemmings who will only join the DDoS effort if somebody puts up a Rapidshare link to the LOIC software. None of them have any kind of initiative to do it themselves. "i'm not gonna get caught. lulz, i'll use a proxy" Furthermore, because they're all just angsty, lonely, horny teenagers (and even some 20-somethings), they have no foresight. They have no clue that their IP address can and will identify them in most cases. If they use a proxy, they're just creating a bottleneck, slowing the DDoS effort and providing their target with a single IP to block for mitigation. "hey man, ip address is just a number, man... i'm not a number!" None of them realize that your IP address can and will be stripped from logs and submitted to RIRs and ISPs, and they will obtain your subscriber details (more likely your parent's details) through the legal system in your country of origin. An IP address is just a number when taken out of context, but when it's put IN context your IP is your identity on the internet, and it CAN be linked back to the real world. "Amazon kicked WikiLeaks off of their servers because BUSH... i mean, OBAMA... sent an executive order to Amazon telling them that he would personally torture their mothers if they didn't! OMG! Attack Amazon because they're a business that chooses not to do business with certain people!!!" The last thing humanity needs is a bunch of angsty teenagers throwing a fit because their favorite website has to change providers. WikiLeaks violated their contract with Amazon. It is a BUSINESS matter. Get the fuck over it, pick up your toys and go to school. Don't like what I'm saying? Then suppress my freedom of speech and DDoS me. My IP is 127.0.0.1. And I'll even turn off my firewall for you.
With the amount of free wifi sites in every city and the extreme number of unprotected (or under protected) home networks, do you really think the lulz kids are stupid enough to use their own? I can guarantee that they are using school computers, cell phones and public or hacked wifi to do this. The only real issue is that the DDOS is unable to be maintained if you are sitting at a cafe since you have to leave at some point. So the creative anonymous is simply going to hack their neighbors wifi with a free linux tool and use that. The cops will then go after the neighbor.
"Take that, you hostile sons-of-bitches!" -- James Coburn, in the finale of _The_President's_Analyst_