I was searching around and was pleasantly surprised when I ran across this new MySQL Troubleshooting book by Sveta Smirnova:
“MySQL Troubleshooting – What To Do When Queries Don’t Work”
http://shop.oreilly.com/product/0636920021964.do
Having worked with Sveta in Support for years, I’m certain this book is chock-full of great troubleshooting techniques and advices (and you can get a good idea from the “Table of Contents” listed on the above page).
I’m always happy to see new MySQL-related books. 
Congratulations, Sveta!
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