Getting Things Done (David Allen) teaches you how to deal with the thousands of small tasks you need to accomplish in your day-to-day job as a software developer. Although it is not specifically geared towards developers, it is definitely an invaluable aid, as software development typically involves a very large number of small tasks that need to be done in a prioritized fashion. For example: which new features to implement, which bugs to fix, which parts of the code to refactor, which parts of the code to rest or retest, etc...