Comprehensive Aramaic Lexicon
The Aramaic Blog by Steve Caruso
Arshama Project Achaemenid Aramaic lessons and reading classes
Inscriptions of Israel/Palestine Brown Univ; includes Hebrew, Greek, Latin, and Aramaic inscriptions
A Bibliography of Semitic Linguistics (1940-2010) by Gregorio del Olmo Lete

Lexicity links to online language resources including Aramaic—not sure how useful it is