And now locating listservs of interest has never been easier thanks to the labors of University of Chicago law librarian Lyonett Louis-Jacques. The Federal Web Locator from Villanova is a monster. Get to Uncle Sam and his millions of minions with this heroically simple search engine. But don't be lazy. Your best bet for state law research is to run a search through your favorite search engine to see what particular states offer online.
Resources vary drastically from one state to another.
Ad hoc research probably is the most effective way to track down state stuff. Search the Federal Register, the Congressional Record, the U.S. Code and lots of other Federal Folderol at this knock-out jump stations for GPO links. The standard attorney directory is now searchable for free online. Don't lug those 28 volumes with you on business trips any more. Login and look up your colleagues with this very welcome addition to the Internet's legal reference resources.