The following web sites are among the most important for classics students:
The American Classical League primarily assists pre-collegiate teachers, and has an important listing of available Latin teaching positions.
The Boston Area Classics Calendar, which is on the web site of the Harvard Classics Department, lists all lectures pertaining to classical antiquity
The Stoa Consortium hosts a number of very important web sites, such as Diotima (devoted to women in Greece and Rome), Demos (with material on the Athenian democracy), as well as links to other sites and blogs.
The Perseus Project has a large collection of electronic texts and images.
The Bryn Mawr Classical Review gives you access to reviews of books on every aspect of classical antiquity.
The National Committee for Latin and Greek, with some amusing and informative material about the study of classics.
The American Philological Association, the national organization of college and university-level classicists.
Classical Association of New England, the regional organization for teachers of Latin and Greek at all levels.