Afro-Asiatic Index Project: Etymological database of Afro-Asiatic languages, outgrowth of the Cushitic Lexicon Project. History and report downloads.
Afro-Asiatic Languages: Wikipedia article, with a useful map.
Maarav: A journal for the study of the Northwest Semitic languages and literatures (published in Rolling Hills Estates, CA, USA).
Semitic Linguistics - Class Notes: Class notes for a course on Semitic linguistics offered at the University of Western Australia, containing an overview of the language family, and detailed information on its writing systems, phonology and morphology, with particular attention to its verbal systems.
The Afro-Asiatic Languages - Classification and Reference List: A scholarly classification of the language family, by Roger Blench.