Books

Lean Software Development : An Agile Toolkit, Mary Poppendieck and Tom Poppendieck . A great resource on how the lean principles from product manufacturing can be applied unto software development. You can find a good overview in their 2002 paper here (pdf) and the Wikipedia article on Lean .

The Passionate Programmer: Creating a Remarkable Career in Software Development (Chad Fowler) and The Pragmatic Programmer (Andrew Hunt and David Thomas).