I've mentioned before that I had a new book coming out.  It's finally available on Amazon.  Again, I didn't write this one; I was just its editor.  It was written by a "dream team" of developers from the SQL Server dev team and support engineers from Microsoft Customer Support Services.  The focus of the book is on troubleshooting issues with the SQL Server database engine, and it's my hope that it will be the "go to" reference for people working through issues with the engine.  You can find the book here