The two volumes of Deleuze and Guattari's influential text: Anti-Oedipus (1972) and A Thousand Plateaus (1980).
Anti-Oedipus sets out a critique of the psychoanalyis of Sigmund Freud and Jacques Lacan. Instead of seeing desire as a lack of something, desire is considered a productive and creative force that is directly present in political and economic life. This idea underpins the proposals for a materialist psychiatry and schizoanalysis, as well as a novel theory of fascism as lurking in paranoid desires. The wikipedia summary is here. Ebook versions of Anti-Oedipus are here.
A Thousand Plateaus builds on and complicates the concepts developed in Anti-Oedipus. The subject matter broadens out from psychoanalysis and the unconscious to topics such as state formation, nomadism, linguistics, fascism (again), technology, political economy, archaeology and anthropology. The wikipedia summary is here.