I finished Never Let Me Go and it was fantastic. Sad, but great. It's best to go into it not knowing at all what it's about, beyond some kids in a boarding school, but even though I knew a sort-of mini-spoiler, it was still worthwhile. Ishiguro's observations, little details, everything: they were spot-on. It was one of those books where I wanted to underline certain passages. Should you read it? If you don't mind things that are a little sad and also a little sci-fi, then absolutely, yes.
I also finished the Bill Bryson book. It ended on a very down note about global warming, unfortunately. I suppose ultimately it's good to bring the topic up; ending on it still made me sad, though.
Now I'm reading Great House by Nicole Krauss. I read A History of Love, her previous book, and adored it. I absolutely recommend it. So far Great House is good, but seems to be comprised of separate short stories. I know from reviews that they end up intertwined eventually, though, and I don't mind.