AncientScripts.com - Provides information about writing systems from all over the world, as well as phonetics and historical linguistics.
Complex-Text Languages - An Overview - Presents an overview of aspects of the writing systems of a large family of languages that are collectively called complex-text languages.
Mesoamerican Writing Systems - Discusses the structure and nature of different orthographic systems used by the Maya, Mixtec, Zapotec, and Aztec cultures.
Omniglot - Guide to writing systems, with details of many different alphabets, syllabaries, and logographic systems.