they are the same hackers who did this:
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http://en.wikipedia.org/wiki/Anonymous_(group)#No_Cussing_Club
In January 2009 members of Anonymous targeted California teen McKay Hatch who runs the No Cussing Club, a website against profanity. As Hatch's home address, phone number, and other personal information were leaked on-line, his family has received a lot of hate mail, lots of obscene phone calls, and even bogus pizza and pornography deliveries.
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It's next to impossible to enable internet vigilantes to knock off turd burglars like the Westboro Baptist Chickens#$! without unleashing incidents like this.
You should also look at what these anti-Westboro hackers did to the SOHH and AllHipHop websites.
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On June 27, the hackers utilized cross-site scripting to alter the website's main page with satirical images and headlines referencing numerous racial stereotypes and slurs, and also successfully stole information from SOHH employees.
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Beware of cheering these guys on. They will hack a site and fill it with racial slurs when they think it's funny.
Edit: I'd rather see people protest Westboro in person. Show them to their faces how much they're disliked. Boycott employers who hire these people, that kind of thing. I support all legal courses of action against Westboro.