Oh this is a good one.  Apparently, someone in the New Jersey Legislature has decided that true anonymous posting should be illegal. To make it more fun, the forum owner is the one that can be taken to court.

So, if you run any kind of forum (this can include a BLOG), and you allow posting by users, you must collect all users legal name and address, and you must verify that they are their legal realnames. If you don’t, and someone takes you to court over someone’s post on your forum, you are liable for copensatory and punitive damages as well as the cost of the lawsuit. And no, your forum doesn’t have to be based in NJ, it counts even if someone can access your forum from NJ.

More information here:

http://yro.slashdot.org/yro/06/03/06/1736234.shtml
http://www.njleg.state.nj.us/2006/Bills/A1500/1327_I1.HTM

I would be very surprised if this ever passed, but you never know, worse laws have made it through.