"I'm the disreputable dog. I'm your friend" <3

- Discworld is an obvious thing here.

- Anathem has a distributed network of libraries of most knowledge with an interesting time-limited distirbution scheme.

- Snow Crash has A Librarian -- and also a hypercard knowledge system.

- If On A Winter's Night, A Traveller by Italo Calvino features books and libraries prominently. They're not exactly magical, but they're not...not magical, either.

edit: it's not a novel, but the library in the sands in Avatar is another fine example of this trope.