BEYOND THE REVOLUTION: My Life and Times Since Famous Long Ago by Ray Mungo (Contemporary Books: $10.95). One of the founders of the Liberation News Service and a minor '60s icon, Ray Mungo tells what he's been doing since the heady days of the student revolution. (Apparently not much.) He comes across as a not very likeable opportunist, smoking dope and partying at other people's expense. Mungo gushes over former members of the counterculture he feels have remained true to its ideals (Dick Gregory is "a saint") and glosses over the fact that many of them are now lawyers, businessmen and real estate agents--exactly what they swore never to become. This former champion of anarchic freedom reports H. Rap Brown's recent condemnation of Salman Rushdie without a word of anger or dismay, although the reader gets the impression he would rush to defend an author attacked by Protestant fundamentalists. Mungo concludes with his credo that Baby Boomers "need to stay in touch" and "will be family"--the Addams Family, perhaps.