I remember The Gods Themselves
pretty well - and I certainly remember the derivation of the title - certainly a useful quotation.
I had the opportunity to talk to Asimov briefly about the book. He said that he wanted to include the aliens because people were forever saying "Asimov doesn't have aliens in his books because he doesn't know how to write them, and I wanted to show them that the old man can so." I thought they were easily as interesting and memorable as, say, Niven's one-trait-defines-a-species alien characters.