Excellent site of Linux resources.

http://www.makelinux.com/resources

Linux resources

• Hyperlink map of Android API classes • Android packages • Android internals • Linux man pages • Map of GNU/Linux OS internals • Interactive map of GNU/Linux OS and FOSS • "GNU/Linux is my home" - map of GNU/Linux system • Interactive map of Linux kernel • Linux inside • Linux Technology Reference (single page view) • Linux kernel diagram • Linux Device Drivers, 3rd Edition • Advanced Linux Programming • Managing Projects with GNU make • 1000 Hacker Tutorials 2008 • Understanding the Linux Kernel, 3rd Edition • Linux Kernel Development, 2nd Edition • Embedded Linux kernel and driver development • Introduction to Linux • Bash Guide for Beginners • Advanced Bash-Scripting Guide • GNU/Linux Command-Line Tools Summary • Linux Filesystem Hierarchy • The Linux Kernel Module Programming Guide • The Linux System Administrator's Guide • Linux Network Administrators Guide • GNU/Linux advanced administration • Autobook: GNU Autoconf, Automake, and Libtool src • Understanding the Linux Virtual Memory Manager Linux related products • Linux kernel poster