Some Excellent Recommendations for 1960s Science Fiction Books Everyone Should Read

Our favorite meme today is the one where people list their top 11 science fiction novels from the 1960s. It started over on Science Fiction Ruminations and then spread to Yellow and Creased. And there are some great, great recommendations in there. I'm struck by the diversity, with the two lists I've seen thus far covering everything from Madeleine L'Engle to Robert Silverberg to Stanislaw Lem.

So what are your top 11 favorite science fiction novels published in the 1960s?