Suggest a MySQL book for me
If you are interested in High Availability and Performance for MySQL, then High Performance MySQL : Optimization, Backups, Replication, and More



is definitely the book for you (Third Edition is out now) !!!

I would still have MySQL 5.0 Certification Study Guide



as well. I used this book as my reference book for 10 months before taking the Certification Exams. In honesty, it has many typos and incorrect facts, all minor in nature.

There is no substitute for Practical Experience. Implement the things leaned from these two books and you will develop the needed confidence to handle,..., no, manhandle MySQL.

If you must use MySQL 4.x, then you will also need MySQL Reference Manual.