In reply to Paul Atkinson:
All due respect to Nicholas Livesey, I found Scott Kelby OK but he left me unsatisfied pretty quickly. He got me started, but I felt there was a lot he didn't explain, and I wanted to understand why I was doing what he was suggesting. I also found his style pretty annoying.
If you understand what you are doing you can make Lightroom - which is an amazng piece of software - a tool of which you are master. So, I'd strongly recommend Jeff Schewe's "The Digital Negative" (which is way shorter than Kelby) and after that Martin Evening's Adobe Lr Handbook.