The Mammoth Book of Poker - Paul Mendelson - UK ISBN 978-1-84529-807-4
This was the first book that I picked up when I decided to take NLHE seriously.
I would really recommend it as a first read, although I have not read the Little Green Book or Super System, this book gave me enough knowledge to base my new game style on.
Texas Hold Em - The basics of the game
NLHE - Starting hands, loads of examples
Tournament Strategy - A good starting strategy for low BI tourneys
Online Poker - Things to remember when playing online
Home Games - How to set up your own home game
LHE - Limit Hold Em
Other Poker Variations - Explains the rest
And the best bits are the bonus ones:
100 Tips for Hold Em - Really good read, helped me a lot.
Tables and Stats - Easy Ref
Tells - Good for Live Poker
On of the best things about this book was the many many sample hands and little quizzes at the end of each section. The book teaches the ABC TAG style of play, which is most recommended for Micro stakes.