Hitchens: Orwell's list: http://www.nybooks.com/articles/2002/09/26/orwells-list/   Timothy Garton Ash had a good article on the same:  http://www.nybooks.com/articles/2003/09/25/orwells-list/   Here's some other reviews

Isaac Asimov

http://www.newworker.org/ncptrory/1984.htm

Aldous Huxley

http://www.lettersofnote.com/2012/03/1984-v-brave-new-world.html