Perspective: Create an e-annoyance, go to jail
Apparently, it is now illegal to be irritating online without disclosing your real name:
"Whoever...utilizes any device or software that can be used to originate telecommunications or other types of communications that are transmitted, in whole or in part, by the Internet... without disclosing his identity and with intent to annoy, abuse, threaten, or harass any person...who receives the communications...shall be fined under title 18 or imprisoned not more than two years, or both."
I checked out the relevant U.S. code, and while I'm sure that this is really not what they meant (the code above is takes a lot of sections and combines them), it's pretty much what they did.
So watch out, anonymous posters! ...Of course, they do have to find you, first.