It also goes beyond court decisions; Fastcase is working on a joint project with Justia to let you search PACER across jurisdictions in the same way — currently a giant pain in the ass, since each jurisdiction is like a silo within PACER.
Listservs can be a good way to get some questions answered by attorneys that love answering questions (both correctly and incorrectly), but they can also be giantpains - in - the - ass.