This is probably the default reference for the combination of lean and software development. I highly suggest everyone to read it at least once of twice. It consists of 22 tools that can help to bring lean thinking to your company, always along with quick examples from the history of one of the authors. I am not entirely sure about the P&L (profit & loss) part of the book, for me this was rather out of scope for my tasks, but is probably another side of the whole thing, too.
Lean Software Development: An Agile Toolkit for Software Development Managersvon Mary Poppendieck / Tom Poppendieck Poppendieck / PoppendieckAddison-Wesley Professional