Twitter
Twitter Must Provide Data on 3 Users, Judge Rules – NYTimes.com
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OtherSources: Wired.com

Internet anonymity and privacy, well times they are a changing.   For the longest time some on the internet have lived thinking that you could say anything or do anything just because they couldn’t see you.  Because they could not see you, they could not find you and you could say whatever you wanted.  Times they are changing my friends.  You can’t just say or do whatever you want if it’s illegal they WILL respond.  It may take them a while but they WILL.  Wireds Threat Level article has a copy of the entire legal documents regarding this ruling.