My previous post of books for developers focused on programming, but if you're a professional programmer/developer/software engineer there are more things you'll need to know besides writing code and algorithms.
Here are some books that I recommend for the professional or those who work with programmers.
The Pragmatic Programmer: From Journeyman to Master - This book describes the craftsmanship aspect of software development.
The Mythical Man-Month: Essays on Software Engineering, Anniversary Edition (2nd Edition) - Describes Brooke's Law that adding man power to a late project makes it later and other wisdom of software development project management.
Peopleware: Productive Projects and Teams (3rd Edition) - Software development is ultimately done by people (not cogs and robots) and it's important to remember that.
The Practice of Programming (Addison-Wesley Professional Computing Series) - Talks about the practical aspect of programming including "topics like testing, debugging, portability, performance, design alternatives, and style."
Facts and Fallacies of Software Engineering - A lot of common sense stuff about software engineering that are often forgotten in the thick of our work.
Making Things Happen: Mastering Project Management (Theory in Practice) - There is a level of project management from individuals to teams that every engineering should be aware of. This is a good pragmatic book about getting projects done and not about specific methodologies.