I blogged about ten books that might be of interest here: http://pourquality.blogspot.com/2008/12/books-books-and-books.html
Sounds like the one that will be most immediately useful to you is Scott Raos The Professional Baristas Handbook. Instaurators Espresso Quest might be the next thing to get after that.
I have also collected a number of links that might be of interest on the right hand pane of my blog: http://www.pourquality.blogspot.com/
Hope that helps,