http://lawprofessors.typepad.com/media_law_prof_blog/2009/06/anonymous-speech-online.html
student article, includes several cases i'd missed,
Virginia v Janes (spammer case), Doe v Cahill (Smyrna case re discovery subpoenas)
ACLU vb Johnson (indecent re minors on internet).
Miguel E. Larios, The John Marshall Law School, has published "E-Publius Unum: Anonymous Speech Rights Online. 5lariosm at stu.jmls.edu

I have written a (draft of a)n amicus brief in the State v Shaffer case.
The text is here: http://shaffercase.blogspot.com/2008/07/3rd-draft-of-amicus-brief.html
If you prefer an .rtf version, email me gtbear at gmail dot com.