Socialism: A Very Brieft Introduction by Michael Newman

Newman's Socialism is an excellent overview and introduction to the main ideas of Socialism, with examinations and comparisons to anarchism, communism, social democracy, feminist socialism, and green socialism. I appreciated the contrast of Swedish social democracy with Cuban Communism and discussion of the development of communist states through the 60s, 70s, and 80s  (and subsequent fall in 80s and 90s.
This primer was a worthwhile and timely follow up to the introductory Marx book I recently finished. 

My main complaint is that I can't remember all the important information!