Recommended sources related with embedded systems

Knowledge

At the beginning, you should know what an embedded system is and what it is used for. I encourage you to read What's Embedded? article which tries to define these kind of systems. 

I think that the most suitable definition of 'embedded systems' is in the introduction of "Embedded C" book written by Michael J. Pont:

"An embedded system is an application that contains at least one programmable computer (typically in the form of a microcontroller, a microprocessor or digital signal processor chip) and which is used by individuals who are, in the main, unaware that the system is computer-based."

Literature

The list below describes books, which I think are very important and helpful in the daily work as embedded system developer:

Internet

I would like here to enumerate the important sources which are related with embedded systems.

Embedded systems

QNX Neutrino

Linux