Colloquial Syrian Arabic, Mary-Jane Liddicoat - goes slowly for the first half, then very fast for the second half and you get the impression there should've been more chapters. Also bizarrely uses some very, very colloquial Damascene lexemes, some of which are markedly 'folksy' even within Damascus and some of which might not be understood even by other Syrians. On the other hand, gives a comprehensive view of basic morphology and morphophonology and a very good base of useful vocabulary and miscellaneous expressions and constructions and leaves you able to have a wide range of transactional conversations (but unlike other textbooks is not restricted to transactional conversation and gives you the tools to build a more general fluency). All in all, the best Levantine Arabic textbook and don't dick you around.

Comprehensive Study of Modern Egyptian Arabic, Ernest T Abdel Massih - Jesus Christ if these books existed for every language nobody would ever be dicked around ever. Consists of a number of different textbooks, beginning with an Introduction to Egyptian Arabic and including an alphabetical reference grammar (?), themed vocabulary lists, texts in colloquial Arabic (plays and so on) and several other resources. Even taken on its own, An Introduction is incredible comprehensive for what it is and very well suited to those of a linguistic bent who are familiar with some of the more basic jargon and want an approach which doesn't simplify or patronise like most language textbooks. Available online, although I don't know if the audio can be found. All in all, don't dick you around.