Romanian Grammar - A very complete reference grammar of Romanian, by Dana Cojocaru. Part of the Reference Grammar Network of the Slavic and East European Language Resource Center.
Romanian Lessons - A series of online Romanian language lessons containing many grammatical explanations and conversational example sentences.
Romanian Verb Inflections - A document describing the verb inflections of Aromanian, Dacoromanian, Meglenoromanian and Istroromanian. Text, charts and maps.