Thanks to TLDP we got some really nice Linux books.

Linux Bash shell scripting
http://tldp.org/LDP/Bash-Beginners-Guide/Bash-Beginners-Guide.pdf

Introduction to Linux
http://tldp.org/LDP/intro-linux/intro-linux.pdf

Linux kernel module programming guide
http://tldp.org/LDP/lkmpg/2.6/lkmpg.pdf

Linux Laptop, PDA
http://tldp.org/LDP/Mobile-Guide/Mobile-Guide.pdf

Linux System Administrator Guide
http://tldp.org/LDP/sag/sag.pdf

Linux Dictionary
http://tldp.org/LDP/Linux-Dictionary/Linux-Dictionary.pdf

Linux Filesystem Hierarchy
http://tldp.org/LDP/Linux-Filesystem-Hierarchy/Linux-Filesystem-Hierarch...

Linux From Scratch
http://tldp.org/LDP/lfs/LFS-BOOK-6.1.1.pdf

Please feel free to download them and make good use of them !