Just Do It...
I have completely worn out my copy of this book. It is the simplest, clearest, most practical book on lean that you will ever find. The first time I used the Value Stream Mapping techniques outlined in this book, I identified an improvement that has dramatically reduced our inventory, reduced lead times and saved over $500K annually.
Section III, entitled, "What Makes A value Stream Lean" is especially helpful. By doing the mapping and working toward the seven guidelines outlined in this section, we have made dramatic progress in our lean transformation. Using "Learning To See" in conjunction with another offering from the Lean Enterprise Institute ("Making Material Flow"), you can transform your plant. The only other requirement... get out from behind your desk and just do it!
I cannot recommend this book highly enough!