The AALL is the trade association for U.S. law librarians. The Association puts out many publications, including the quarterly Law Library Journal and a directory of librarians and member libraries, which is searchable on the Association's Web site (www.aallnet.org). In addition, AALL hosts an annual meeting, provides scholarships and a job hotline, sponsors a system of universal legal citations, and does many other very useful things.
You can link to AALL's regional "Chapter" websites using the online Chapter Finder.