+1 for "In Praise of Idleness", some of the essays from the 20s and 30s that are still contemporary (including one of my favourites Russell's essays: The Ancestry of Fascism) and, of course, the self-titled one is a discussion we see a lot now with all the automation lurking on the horizon.

"Neuromancer" I wouldn't say that would be in my list of "fundamentally" changed the way I think, it's a good story with a cool narrative style but in the sci-fi genre I'd put "Childhood's End" way before "Neuromancer" in changing the way I think.