There has been a lot happening around the blogosphere related to Halloween crackdowns on sex offenders. Perhaps most notably, a federal district court in Missouri has issued a preliminary injunction barring some efforts in that state. From the order:
Constitutional Law Prof, Above the Law, Althouse, TalkLeft, SexOffenderResearch, and Volokh Conspiracy are also covering the case. SexOffenderResearch also has a lot of other posts about ongoing crackdowns in other states.