[MaysonL]

When considering intelligence amplification, the book that comes to mind is Psychohistorical Crisis, by Donald Kingsbury. Computer-to-brain interfaces may go a long way in the next few thousand years.

https://en.wikipedia.org/wiki/Psychohistorical_Crisis

[arethuza]

Also Vernon Vinge's Rainbows End which has both IA and AI in a fairly plausible near future scenario:

https://en.wikipedia.org/wiki/Rainbows_End