Books that changed the world - the 50 most influential books in human history by Andrew Taylor ISBN 978-1-84724-602-8
This is an excellent book about books.
I suppose a list of the 50 most influential books is meant to provoke some debate, so perhaps my knowledge of books is lacking but it was hard to argue with the choice.
Some books, the Bible, the Qu'ran are obvious - most of the others have a very strong case. I won't spoil the fun by iving the full list now.
The writing is concise and informative giving reason for inclusion, context, influence and a flavour of the book.
As an overview of books and their inluence, it is probably hard to beat.