That was scary for a while, but luckily it's gotten better. A poster in New Jersey was criticizing a politician, so the politician sued for slander, got a subpoena and went to get his name. The poster defended himself and recently won his case to not have his real name automatically revealed due to a subpoena. The politician must prove the slander suit would survive on its merits. He also has to convince the court that he's not going to pull a common tactic -- bring the suit to get the name, only to drop the suit once he has it, then take private retribution against the poster. This is the tactic used by the RIAA to find file sharers.
I also like that the decision cited the Federalist Papers in emphasizing the important nature of anonymous political speech.
that does raise an interesting question regarding FR though... i wonder if they do track IP addresses of posts? that is the one connecting piece of information that is used to trace and 'anonymous' id back to a user's ISP which, along with time based recording, can identify the computer from which the post was made.