I've read...no, wait, that was American Gods. Well, I've read Neverwhere too. I really like Gaiman's stuff, but for some reason it doesn't stick with me. I've read American Gods three times now, and I still barely remember it. And I've forgotten everything about Neverwhere except the back cover copy.
Strange. His details stick really well with me. My favorite, so far, has been Anansi Boys.
I found it derivative of The Forever War, but your mileage may vary.
I don't mind derivative so much, if he also does something new with it in the process. Scalzi also did Fuzzy Nation, a rewrite of H. Beam Piper's Little Fuzzy, and while it was clearly and explicitly derivative, there were new bits for thought in there.
Is Engineers the sequel or the sequel's sequel? I read the former but not the latter. Will have to see about getting them used somewhere.
It goes Ringworld, Ringworld Engineers, Ringworld Throne, Ringworld's Children, Fate of Worlds. I'm rereading the first two, so I can approach the latter books.
There's also a set of prequels that I haven't read yet - Niven was a major foundation of my science fiction reading, but I basically devoured what my brother had in his library, and then didn't myself continue to keep up with the author too well.