Check out Cleveland blogger Erin O'Brien [1]'s post, A beautiful comeuppance [2], on a Manhattan Supreme Court judge's decision to require Google to reveal the identity of a [previously anonymous] blogger found guilty of defamation, having called a semi-famous fashion model a “a psychotic, lying, whoring, still going to clubs at her age, skank.”
See The First Amendment rights of anonymous defamers [3] for a bit more on the legal precedents involved.
Links:
[1] http://erin-obrien.blogspot.com/
[2] http://erin-obrien.blogspot.com/2009/08/beautiful-comeuppance.html
[3] http://government.zdnet.com/?p=5268