There's also "The Sleeper Awakes" from HG Wells:
http://www.feedbooks.com/discover/view_book/593
Or "socialist utopias" like Looking Backward and Equality:
http://www.feedbooks.com/discover/view_book/829
http://www.feedbooks.com/discover/view_book/824
And of course, "the original", Utopia from Thomas More:
http://www.feedbooks.com/discover/view_book/198
Got quite a few utopia/dystopia in my p-books too. Ira Levin's "The perfect day" for example:
http://www.amazon.com/This-Perfect-D.../dp/0394448588
Or Mockingbird from Walter Tevis.